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To derive a voltage reference (e.g., band gap regulator)

Subclass of:

323 - Electricity: power supply or regulation systems

323304000 - SELF-REGULATING (E.G., NONRETROACTIVE)

323311000 - Using a three or more terminal semiconductive device as the final control device

323312000 - For current stabilization

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
323314000 With additional stage 19
Entries
DocumentTitleDate
20130027018BOOSTER CIRCUIT, SOLID-STATE IMAGING DEVICE, AND CAMERA SYSTEM - A booster circuit including an output terminal; a reference voltage generating section that generates a boosting reference voltage; a charge pump section that boosts the reference voltage and outputs the boosted reference voltage from the output terminal; and an output-terminal voltage holding section that holds the output terminal at a voltage of a high level at a standby time. The charge pump section includes an input node, at least one boosting node, at least one reference node, at least one boosting capacitor, and a plurality of switching transistors that are provided between the input node and the at least one boosting node, between a boosting node at a last stage and the output terminal, between the input node and the reference node, and between a reference potential and a reference node, and are switched on or off by a switch signal.01-31-2013
20090302822Voltage regulator - A voltage regulator comprises first and second bipolar transistors operating at different current densities; a resistor is connected between their bases across which ΔV12-10-2009
20090189590BAND-GAP REFERENCE VOLTAGE SOURCE CIRCUIT - A band-gap reference voltage source circuit is constituted of a diode-pair circuit connected to a reference voltage output terminal, a first differential amplifier including a first transistor and a first operational amplifier, and a second differential amplifier including a second transistor and a second operational amplifier. The second differential amplifier operates based on a bias voltage, which is lower than a predetermined voltage, so as to forcedly pull up the level of the reference voltage output terminal via the second transistor before the first differential amplifier starts to pull up the level of the reference voltage output terminal up to the predetermined voltage via the first transistor.07-30-2009
20100164466Reference Voltage Generation Circuit - A reference voltage generation circuit is disclosed. The reference voltage generation circuit includes an operational amplifier configured to output a constant voltage in accordance with reference voltages input to first and second terminals of the operational amplifier, and a start-up circuit configured to initiate operation of the operational amplifier when the start-up circuit switches from an idle mode to an active mode, including a first transistor having a gate connected to an output of the operational amplifier, a source connected to a supply voltage, and a drain connected to a resistor, configured to supply a reference current to the resistor in accordance with the operational amplifier output, thereby generating the reference voltage.07-01-2010
20100164465LOW VOLTAGE BANDGAP REFERENCE CIRCUIT - A bandgap reference circuit provided for generating an output reference substantially independent of temperature and power includes a first reference signal generator, a first impedance, a second reference signal generator and a second impedance. The first reference signal generator can generate a first reference signal proportional to absolute temperature. The second reference signal generator generates a second reference signal complementary to absolute temperature according to the first reference signal. The second impedance, the serially-coupled first impedance and second reference signal generator, and the first reference signal generator are coupled in parallel between two nodes. The bandgap reference circuit outputs the output reference voltage through the two nodes. According to an embodiment of the invention, the bandgap reference circuit can be implemented by an additional circuit of lower complexity to obtain a lower reference voltage.07-01-2010
20100164468Work Function Based Voltage Reference - A voltage reference is created from an operational amplifier circuit having two substantially identical P-channel metal oxide semiconductor (P-MOS) transistors with each one having a different gate dopant. The different gate dopants result in different threshold voltages for each of the two otherwise substantially identical P-MOS transistors. The difference between these two threshold voltages is then used to create the voltage reference equal to the difference. The two P-MOS transistors are configured as a differential pair in the operational amplifier circuit and the output of the operational amplifier is used as the voltage reference.07-01-2010
20100164467REFERENCE VOLTAGE GENERATION CIRCUIT - A reference voltage generation circuit includes an operational amplifier for outputting a constant voltage in accordance with reference voltages respectively input to an inverting terminal of the operational amplifier and a non-inverting terminal of the operational amplifier, and a start-up circuit for waking up the operational amplifier when the start-up circuit is switched from an idle mode to an active mode. The start-up circuit includes a first-type transistor having a gate connected to an output of the operational amplifier, a source connected to a supply voltage, and a drain connected to resistors, to supply a constant reference current to the resistors in accordance with an output voltage from the operational amplifier, thereby generating a band-gap output voltage. The resistors are connected in parallel to a stage, from which the band-gap output voltage is output, in order to generate a band-gap output voltage of about 0.6V.07-01-2010
20090121700CONSTANT VOLTAGE CIRCUIT - An inverse temperature characteristic generating circuit decreases an output voltage V05-14-2009
20100072972BAND GAP REFERENCE VOLTAGE CIRCUIT - Provided is a band gap reference voltage circuit having an improved power supply rejection ratio. Owing to a voltage supply circuit (03-25-2010
20130043859METHOD FOR ADJUSTING A REFERENCE VOLTAGE BASED ON A BAND-GAP CIRCUIT - The method adjusts a reference voltage of an electronic circuit based on a band-gap voltage supplied by a first band-gap stage. The band-gap stage includes a current source connected to a first branch, which includes a first configurable resistor in series with a first diode, and to a second branch, which includes a second configurable resistor connected to a complementary resistor in series with a second diode. The current source is a PMOS transistor controlled by an output voltage of a first operational amplifier of a current control loop. The appropriate binary word for configuring the configurable resistors is determined based on four band-gap voltage values measured at two different temperatures and two resistive values of the resistors configured by the same first binary word and by the same second binary word which is different from the first binary word.02-21-2013
20100102795BANDGAP VOLTAGE REFERENCE CIRCUIT - A voltage reference circuit includes an operational amplifier, an output P-type MOS transistor, a first resistor, a first BJT, a second BJT, a third resistor, and a plurality of output resistors connected in series. A gate of the output P-type MOS transistor is electrically connected to an output end of the operational amplifier, and a drain of the output P-type MOS transistor is electrically connected to a voltage source. The gate of the output P-type MOS transistor is controlled by the output end of the operational amplifier, so that the drain current of the output P-type MOS transistor can match the current of the first resistor, the third resistor, and the plurality of output resistors connected in series.04-29-2010
20130038317METHOD AND CIRCUIT FOR LOW POWER VOLTAGE REFERENCE AND BIAS CURRENT GENERATOR - Circuits for generating a PTAT voltage as a base-emitter voltage difference between a pair of bipolar transistors. The circuits may form unit cells in a cascading voltage reference circuit that increases the PTAT voltage with each subsequent stage. The bipolar transistors are controlled using a biasing arrangement that includes an MOS transistor connected to a current mirror that provides the base current for the bipolar transistors. A voltage reference is formed by combining a PTAT voltage and a CTAT voltage at the last stage. The voltage reference may be obtained from the voltage at an emitter of one of the bipolar transistors in the last stage.02-14-2013
20100109633INTEGRATED CIRCUIT AND A METHOD FOR RECOVERING FROM A LOW-POWER PERIOD - A system that has low power recovery capabilities, the system includes: a switch that is adapted to provide a gated power supply to a power gated circuit in response to a control current; and a control signal generator adapted to control an intensity of the control current in response to a reception of a low power period end indicator, a value of the continuous supply voltage at a port of the control signal generator, a value of the gated supply voltage and an output signal of a high switching point buffer that is inputted by the gated supply voltage.05-06-2010
20080315855Low power bandgap voltage reference circuit having multiple reference voltages with high power supply rejection ratio - A voltage generator is used for generating a voltage reference with high power supply rejection. One embodiment of the circuit includes a voltage regulator and a bandgap voltage circuit and an amplifier. The voltage regulator including an input node is coupled to an external power supply for generating a regulated voltage source. A bandgap voltage circuit includes a first and a second resistor and a first and a second transistor to generate a voltage difference between the base-to-emitter voltages of the first and the second transistors. The second resistor is coupled to the first resistor and the first transistor for generating the first predetermined voltage in response to the voltage difference. An amplifier circuit is coupled to the first transistor of the bandgap voltage circuit for receiving a first amplifying signal and generating an amplified signal so as to regulate the regulated voltage source.12-25-2008
20100039091START-UP CIRCUIT FOR BANDGAP CIRCUIT - A start-up circuit is provided for a bandgap circuit, the bandgap circuit having at least one bandgap diode. The start-up circuit comprises a comparator for providing a start-up voltage for the bandgap circuit. The comparator is connected to receive a first reference voltage at a first input terminal, the output of the comparator being connected in a feedback loop to its second input terminal. A reference voltage circuit is provided for generating the first reference voltage for the first input terminal of the comparator. The reference voltage circuit comprises a start-up circuit diode that is matched with the at least one bandgap diode in the bandgap circuit. As such, any temperature and/or process variations in the bandgap diode are matched by the start-up circuit diode, thereby providing an accurate and reliable reference voltage, and hence start-up voltage for the bandgap circuit.02-18-2010
20100327841SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - The present invention provides a technique for reducing current consumption in a reference voltage forming circuit without a significant increase in area while suppressing considerable degradative difference in reference voltage accuracy between a normal operation mode and a standby mode. In the standby mode, by using a clock signal fed from an oscillator circuit, the frequency-division control circuit produces an enable signal VREFON for determining ON/OFF states of the reference voltage generator circuit, the reference voltage forming circuit, and the capacitance charging regulator, and also produces a sampling/holding signal CHOLDSW for performing control so that a holding capacitor CH in a holding capacitance circuit is charged during an ON period of the reference voltage generator circuit, the reference voltage forming circuit, and the capacitance charging regulator, and so that any paths other than a leak current path are made unavailable to the holding capacitor CH during an OFF period thereof. Current consumption can be reduced significantly by intermittently turning ON/OFF the reference voltage generator circuit, the reference voltage forming circuit, and the capacitance charging regulator, each of which would otherwise consume a relatively large amount of current for operation thereof.12-30-2010
20130049729SEMICONDUCTOR CIRCUIT FOR OUTPUTTING REFERENCE VOLTAGES - A semiconductor circuit includes a control signal generation circuit configured to generate control signals in response to a voltage characteristic determination signal and a reference voltage generation circuit configured to output a main reference voltage, having one of a first characteristic of being proportional to temperature, a second characteristic of being constant irrespective of temperature, and a third characteristic of being inversely proportional to temperature, in response to the control signals.02-28-2013
20100001709SYSTEM TO GENERATE A REFERENCE FOR A CHARGE PUMP AND ASSOCIATED METHODS - A system to generate a reference for a charge pump may include a diode-connected transistor providing a reference voltage, and an output transistor. The system may also include a reference circuit to provide a current that is substantially temperature insensitive and the reference circuit delivers the current across the diode-connected transistor thereby enabling the reference voltage to move with processing of the diode-connected transistor.01-07-2010
20130069616OFFSET CALIBRATION TECHNIQUE TO IMPROVE PERFORMANCE OF BAND-GAP VOLTAGE REFERENCE - Offset calibration technique to improve performance of band gap voltage reference. An example of a bandgap reference source includes an output resistor, a first and second transistors and a differential amplifier. A positive-input calibration phase switch is in communication with a positive amplifier input, a emitter of the first and second transistor and a negative-input calibration phase switch in communication with the negative amplifier input, the emitter of the first and second transistor. A positive-output calibration phase switch is in communication with the positive amplifier output, the first and second terminal of the output resistor and a negative-output calibration phase switch is in communication with the negative amplifier output, the first and second terminal of the output resistor. An adjustable resistance is in communication with the emitter of the first transistor, the emitter of the second transistor, and the second terminal of the output resistor.03-21-2013
20090302823Voltage regulator circuit - A voltage regulator comprises first and second bipolar transistors operating at different current densities; a resistance is connected between their bases across which ΔV12-10-2009
20130057246REFERENCE SIGNAL GENERATING CIRCUIT - According to one embodiment, a reference signal generating circuit includes a first nonlinear element that generates a first reference voltage, a second nonlinear element that generates a second reference voltage, a current controlling circuit that controls a current flowing to the first nonlinear element and a current flowing to the second nonlinear element based on an output voltage of the current controlling circuit itself, and N temperature characteristic adjusting elements (N is an integer of 2 or larger) that individually adjust the temperature characteristics of the output voltage of the current controlling circuit.03-07-2013
20090267585CASCODE CURRENT MIRROR CIRCUIT, BANDGAP CIRCUIT, REFERENCE VOLTAGE CIRCUIT HAVING THE CASCODE CURRENT MIRROR CIRCUIT AND THE BANDGAP CIRCUIT, AND VOLTAGE STABILIZING/REGULATING CIRCUIT HAVING THE REFERENCE VOLTAGE CIRCUIT - A cascode current mirror circuit and a bandgap circuit are provided. The circuits are used together and function as a reference voltage circuit. The reference voltage circuit outputs a reference current resistant to temperature variation and ripple-voltage. Accordingly, a voltage stabilizing/regulating circuit corrects error voltage precisely and promptly, and the resultant voltage is temperature insensitive and ripple-voltage-independent.10-29-2009
20110012581BANDGAP CIRCUIT HAVING A ZERO TEMPERATURE COEFFICIENT - A bandgap circuit is provided, which includes a current source, a voltage boost circuit, a voltage input circuit, a voltage equalizer circuit, and a voltage output circuit. The current source provides a first current, a second current, and a third current, which are equal to one another. The voltage boost circuit provides a boost voltage by a single current path. The voltage input circuit receives the first and the second currents, and provides a first input voltage and a second input voltage based on the boost voltage. The voltage equalizer circuit receives the first and the second input voltages and equalize the two input voltages. The voltage output circuit provides a bandgap reference voltage according to the third current.01-20-2011
20110037451BANDGAP VOLTAGE REFERENCE CIRCUIT - A bandgap voltage reference circuit comprising: a first P-N junction circuit generating a first voltage which changes according to a first characteristic; a second P-N junction circuit generating a second voltage which changes according to a second characteristic different from the first characteristic; an amplifier receiving the first and second voltages at a pair of input terminals and changing the amount of an output current provided from a high-voltage power supply to an output terminal according to a difference voltage between the first and second voltages, wherein an output voltage at the output terminal is provided to the first and second P-N junction circuits; and an output current controller causing the amplifier to provide the output current to the output terminal regardless of the difference voltage when the output voltage equals to or is smaller than a threshold voltage.02-17-2011
20130063123SEMICONDUCTOR DEVICE - A semiconductor device includes high-side and low-side switching elements totem-pole-connected between high-voltage-side and low-voltage-side potentials; a high-side drive circuit, having high-voltage and low-voltage terminals which are connected to a floating power supply, which supplies either a voltage at the high-voltage terminal or a voltage at the low-voltage terminal for driving the high-side switching element; and a low-side drive circuit driving the low-side switching element and a reference voltage circuit generating a reference voltage between the voltages at high-voltage and low-voltage terminals of the high-side drive circuit. The reference voltage circuit supplies the reference voltage to a connection point between the high-side and low-side switching elements. The semiconductor device includes a charging switching element having a control terminal, a first terminal connected to the low-voltage terminal of the high-side drive circuit, and a grounded second terminal.03-14-2013
20130162238REFERENCE POTENTIAL GENERATION CIRCUIT - A reference potential generation circuit is provided. The reference potential generation circuit includes first to third input terminals, first and second output terminals, a low-pass filter including first to third terminals, and a linear regulator including first to fourth terminals. In the reference potential generation circuit, the first terminal of the low-pass filter is electrically connected to the second input terminal. The second terminal of the low-pass filter is electrically connected to the first input terminal or the third input terminal The third terminal of the low-pass filter is electrically connected to the first terminal of the linear regulator. The second terminal of the linear regulator is electrically connected to the first input terminal and the first output terminal. The third terminal of the linear regulator is electrically connected to the second output terminal. The fourth terminal of the linear regulator is electrically connected to the third input terminal.06-27-2013
20090009151REFERENCE VOLTAGE GENERATOR WITH BOOTSTRAPPING EFFECT - An integrated electronic device for generating a reference voltage. The circuitry has a bias current generator for generating a first bias current, a diode element coupled to the bias current generator and fed by a second bias current derived from the first bias current for converting the second bias current into a reference voltage across the diode element, a supply voltage pre-regulator stage for regulating the supply voltage used for the bias current generator, and an output buffer coupled to the reference voltage for providing a low impedance output, wherein the reference voltage is coupled to the supply pre-regulator stage for biasing the supply pre-regulator stage by the reference voltage.01-08-2009
20100127689REFERENCE VOLTAGE GENERATION CIRCUIT AND BIAS CIRCUIT - A reference voltage generation circuit comprises: a first depletion mode FET; a second depletion mode FET; a first resistor; a first bipolar transistor; a second resistor; a second bipolar transistor; a third bipolar transistor; a third resistor; a third depletion mode FET having its drain connected to a second end of the first resistor and to the collector of the first bipolar transistor; and a fourth bipolar transistor having its base and collector connected to the gate and the source of the third depletion mode FET, and its emitter grounded, wherein source voltage of the second depletion mode FET is output as a reference voltage.05-27-2010
20090121698BANDGAP VOLTAGE REFERENCE CIRCUITS AND METHODS FOR PRODUCING BANDGAP VOLTAGES - A bandgap voltage reference circuit includes a first circuit portion and a second circuit portion. The first circuit portion generates a voltage complimentary to absolute temperature (VCTAT). The second circuit portion generates a voltage proportional to absolute temperature (VPTAT) that is added to the VCTAT to produce a bandgap voltage reference output. The first circuit portion includes a plurality of delta base-emitter voltage (VBE) generators, connected as a plurality of stacks of delta VBE generators. Each delta VBE generator can include a pair of transistors that operate at different current densities and thereby generate a difference in base-emitter voltages (ΔVBE). The plurality of delta VBE generators within each stack are connected to one another, and the plurality of stacks of delta VBE generators are connected to one another, such that the ΔVBEs generated by the plurality of delta VBE generators are arithmetically added to produce the VPTAT.05-14-2009
20090121699BANDGAP REFERENCE VOLTAGE GENERATION CIRCUIT IN SEMICONDUCTOR MEMORY DEVICE - Bandgap reference voltage generation circuit in semiconductor memory device includes a first current generator configured to generate a first current proportional to a change of a temperature by using temperature characteristic of a diode-connected MOS transistor, a second current generator configured to generate a second current inversely proportional to the change of the temperature by using the temperature characteristic of a diode-connected MOS transistor and a summation unit configured to mirror and sum the output currents of the first current generator and the second current generator, and output a reference voltage.05-14-2009
20120187935Voltage Regulator with Pre-Charge Circuit - A regulator circuit is provided having multiple regulated output voltages. In accordance with various example embodiments, a regulator includes first and second pass transistors driven by a reference voltage generator circuit. The first pass transistor has a gate coupled to an output of the reference voltage generator circuit. A switching circuit is configured to couple the output of the reference voltage generator circuit to the gate of the second pass transistor in response to the enable signal being in a first state. The regulator includes a pre-charge circuit configured to charge the gate of the second pass transistor in response to an enable signal being in the first state.07-26-2012
20110291639SEMICONDUCTOR INTEGRATED CIRCUIT - A semiconductor integrated circuit includes an internal reference voltage generation unit configured to generate an internal reference voltage; a high voltage generation unit configured to pump an external driving voltage based on the internal reference voltage applied from the internal reference voltage generation unit, and generate a high voltage having a specified level; and a reference voltage transfer unit configured to generate a test reference voltage from a reference voltage in a package test mode to correspond to a change in a driving operation of the external driving voltage applied from outside, and monitor and force the internal reference voltage.12-01-2011
20110291638Clock Integrated Circuit - The clock circuit of an integrated circuit operates with tolerance of variation in power. A compensation circuit is powered by a supply voltage. The compensation circuit generates a compensated voltage reference, which is compensated for variation in the supply voltage. The compensated voltage reference is compared by comparison circuitry against an output of timing circuitry, to determine timing of the clock signal.12-01-2011
20110043184CMOS Bandgap Reference Source Circuit with Low Flicker Noises - The present abstract discloses a CMOS bandgap reference source circuit, comprising a startup circuit, a power-off control circuit, a reference voltage generating circuit and an operational amplifier. The positive and a negative input terminal of the operational amplifier both consist of two same field effect transistors and both are provided with an input controlled switch; by doing so, two field effect transistors in the positive terminal and two field effect transistors in the negative terminal work alternately between their strong inversion and cut-off region so as to drastically reduce the noises of the reference circuit, which results originally from the flicker noises of two input transistors of the operational amplifier.02-24-2011
20090302824REFERENCE VOLTAGE GENERATING APPARATUS AND METHOD - A method and apparatus for generating a low reference voltage having low power consumption characteristics is provided. A reference voltage generating apparatus includes a constant current source circuit which generates a reference current. A load circuit is connected to the constant current source circuit and generates a voltage which is proportional to the reference current. A current branch circuit removes a portion of temperature-invariant current components included in the reference current from a connection terminal of the constant current source circuit and the load circuit to a ground terminal through a current branch which is different from a current branch of the load circuit.12-10-2009
20100001711REFERENCE CIRCUIT AND METHOD FOR PROVIDING A REFERENCE - A reference circuit configured to provide a reference value. The circuit includes a first circuit unit which is configured to provide a first electrical representation that varies linearly with temperature and has a crossover point where its polarity relative to zero changes from a negative value to a positive value. A second circuit unit is configured to provide a second electrical representation that varies linearly with temperature. The first and second circuit units are operable for facilitating combining the first and second electrical representations such that the combination has a value corresponding to the value of the second electrical representation at a reference temperature.01-07-2010
20100001710REFERENCE VOLTAGE GENERATING CIRCUIT - A reference voltage generating circuit provides a stabilized reference voltage and includes; a clock generator providing a clock signal, a high voltage generator providing a pumping voltage in response to the clock signal, a ripple eradicator providing a static voltage by removing voltage ripple from the pumping voltage, and a reference voltage generator providing the reference voltage.01-07-2010
20090066313Reference voltage circuit compensated for temprature non-linearity - Disclosed is a reference voltage circuit including first, second and third current-to-voltage converters, a current mirror circuit that supplies the currents to the first, second and third current-to-voltage converters, and a control unit that exercises control so that a preset output voltage of the first current-to-voltage converter will be equal to a preset output voltage of the second current-to-voltage converter. A preset voltage of the third current-to-voltage converter is output as a reference voltage. The first current-to-voltage converter includes a diode and a resistor connected in parallel with the diode. The second current-to-voltage converter includes a plurality of diodes, connected in parallel with one another, a resistor connected in parallel with the parallel-connected diodes, a resistor connected in series with the parallel connection of the diodes and the resistor, and a resistor connected in parallel with the serial connection of the parallel circuit and the resistor. The third current-to-voltage converter includes a resistor.03-12-2009
20080315856BANDGAP REFERENCE VOLTAGE GENERATOR CIRCUIT - A bandgap reference voltage generator circuit includes a substrate made of a semiconductor of a first conductivity type, a first transistor formed on the substrate, a second transistor formed on the substrate and having a base commonly connected to the base of the first transistor, a light absorption region formed on the substrate, having a second conductivity type, and connected in parallel between the collector layer of the second transistor and the substrate and a reference voltage output terminal commonly connected to the bases of the first and second transistor. The area of the collector layer of the first transistor is larger than the area of the collector layer of the second transistor.12-25-2008
20090309569MULTI-STABLE ELECTRONIC CIRCUIT STATE CONTROL - Apparatus and methods of controlling operating states of multi-stable electronic circuits are disclosed. In one aspect, an apparatus includes a bandgap reference circuit having an operating state and a latched off state. The bandgap reference circuit includes an amplifier to provide a bandgap reference voltage when the bandgap reference circuit is in the operating state. A state control circuit is also included and is coupled to sense an output signal of the bandgap reference circuit. The state control circuit is also coupled to provide a drive signal to an input of the amplifier in response to the sensed output signal. The drive signal is coupled to cause the bandgap reference circuit to avoid the latched off state.12-17-2009
20100007324VOLTAGE REFERENCE ELECTRONIC CIRCUIT - The invention relates to a temperature-independent voltage reference circuit. The circuit comprises a first circuit of bandgap type providing a first-order temperature-stable voltage, on the basis of a bipolar transistor base-emitter voltage having a negative slope of variation as a function of temperature, and of a voltage or a current having a positive slope of variation as a function of temperature provided by a generator of current proportional to absolute temperature. The base currents of the PMOS transistors thereof are compensated in such a manner that the output current is proportional to a collector current and not an emitter current. A summator establishes a linear combination, with respective weighting coefficients, of three voltages which are respectively the output voltage of the first circuit, the output voltage of a second circuit providing a voltage proportional to the difference between the absolute temperature T and a reference temperature Tr, and the output voltage of a third circuit providing a voltage proportional to the square of this difference.01-14-2010
20110062938BANDGAP VOLTAGE REFERENCE WITH DYNAMIC ELEMENT MATCHING - A voltage reference source is provided that includes a Brokaw bandgap core comprising a first set of transistors, a second set of transistors coupled to the first set of transistors and serving as load devices to the first set of transistors, and a dynamic element matching circuit coupled to the first and second sets of transistors so as to cancel the offset and noise produced by a selective number of the second set of transistors.03-17-2011
20110062937Low Voltage Bandgap Voltage Reference Circuit - A temperature compensated low voltage reference circuit can be realized with a reduced operating voltage overhead and reduced spatial requirements This is accomplished in several ways including integrating one or more bipolar junction transistors into a current differencing amplifier and reducing the number of components required to implement various voltage reference circuits. All of the reference circuits may be constructed with various types of transistors including DTMOS transistors.03-17-2011
20120293154GENERATION OF A TEMPERATURE-STABLE VOLTAGE REFERENCE - A circuit for generating a temperature-stable reference voltage, including, between two terminals of application of a D.C. voltage: a current source and at least two parallel branches, each comprising a resistive element and one or several transistors, the transistors being different form one another and the reference voltage being sampled between the terminals of said branches.11-22-2012
20090167280Voltage Generating Circuit - A voltage generating circuit for generating a plurality of associated voltages includes a constant current source for generating a constant current; a plurality of resistors connected in series to the constant current source in series for generating a plurality of associated reference voltages; and a first controlled switch connected to a first resistor in parallel, wherein the plurality of associated reference voltages are changed by optionally conducting the first controlled switch to control the flow of the constant current through the first resistor.07-02-2009
20090001958Bandgap circuit - A bandgap circuit according to an embodiment of the present invention includes a load circuit arranged between an output terminal and a first power supply line, an output transistor arranged between the output terminal and a second power supply line, and outputs a desired reference voltage in accordance with control voltage, a control voltage generating circuit generating the control voltage applied to the output transistor, and a filter arranged between the output transistor and the control voltage generating circuit.01-01-2009
20090284243AUTO-NULLED BANDGAP REFERENCE SYSTEM AND STROBED BANDGAP REFERENCE CIRCUIT - An auto-nulled bandgap reference system employing a substrate bandgap reference circuit with primary and auxiliary amplifiers and a switching circuit which in a first mode develops a voltage to null the offset and noise errors of the auxiliary amplifier and then in the second mode uses the nulled auxiliary amplifier to develop a voltage to null the offset and noise errors of the primary amplifier; and a strobe circuit including an output storage device and a strobe control circuit for periodically powering up a bandgap reference circuit to charge the output storage device and powering down the bandgap reference circuit to conserve power.11-19-2009
20090284242System and Method for Generating a Reference Voltage - In one embodiment, a circuit having a chopper stabilized amplifier and a network coupled in feedback with the chopper stabilized amplifier is disclosed. The circuit also has a plurality of switches coupled to an output of the chopper stabilized amplifier, and a summing network coupled to the plurality of switches. Ones of the plurality of switches are coupled to ones of a plurality of the summing network inputs.11-19-2009
20090289614REFERENCE BUFFER CIRCUIT - A reference buffer circuit with high driving capability is disclosed. In which, a buffering stage has a first NMOS transistor and a first PMOS transistor to provide high and low tracking voltages respectively based on a high input voltage and a low input voltage. A first driving stage is driven by the high and low tracking voltages to output a first high output voltage and a first low output voltage. A body of the first PMOS transistor is tied to a first bias voltage lower than a supply voltage for the buffering and first driving stages.11-26-2009
20090261801LOW-VOLTAGE CURRENT REFERENCE AND METHOD THEREOF - A low-voltage current reference providing a current being substantially constant with temperature includes a low voltage bandgap, a start circuit coupled to the low voltage bandgap, and a current summer coupled to the low voltage bandgap and to the start circuit. The low voltage bandgap is for providing a constant voltage reference, and the start circuit is for starting the low voltage bandgap from a non-start mode and for providing a proportional to absolute temperature (PTAT) current reference. The current summer is for providing a constant current reference according to the constant voltage reference and the PTAT current reference.10-22-2009
20090153125ELECTRONIC CIRCUIT - An electronic circuit is disclosed. The electronic circuit includes a bandgap circuit provided with first and second bipolar transistors that are coupled at a first node and a current mirror circuit provided with third and fourth transistors with respective control terminals coupled at a second node. The electronic circuit further includes a fifth transistor that is bipolar which is coupled to an output terminal of the third transistor where a base of the fifth transistor is coupled to a collector of the second transistor and a sixth transistor that is bipolar that is coupled to an output terminal of the fourth transistor with a base of the sixth transistor coupled to the first node. A control circuit controls a current provided to the bandgap circuit based on an output of the current mirror circuit. A reference voltage output terminal is provided between the control circuit and the bandgap circuit and outputs a reference voltage.06-18-2009
20110199069Band Gap Reference Circuit - A band gap reference circuit comprises a first branch (08-18-2011
20100102794BANDGAP REFERENCE CIRCUITS - A bandgap reference circuit is provided. An input node receives a supply voltage. An output node provides a reference voltage. A first transistor is coupled between the input node and the output node and has a first control terminal. A resistor is coupled between the input node and the first control terminal. A second transistor is coupled to the first control terminal and has a second control terminal coupled to the output node. A third transistor is coupled between the second transistor and a ground terminal and has a third control terminal. A voltage dividing unit provides a first voltage and a second voltage according to the reference voltage. A differential amplifier provides a signal to the third control terminal according to a difference between the first and second voltages.04-29-2010
20080309308HIGH CURRENT DRIVE BANDGAP BASED VOLTAGE REGULATOR - A high current drive bandgap based voltage regulator for providing a reference voltage at a an output voltage at a designed output voltage value. The high current drive bandgap based voltage regulator includes a high current drive output transistor, a feedback network, an output terminal and an operational amplifier. The feedback network is coupled between the output of the transistor and the input of the transistor. The operational amplifier is in the feedback network and has at least two operational amplifier input terminals and an operational amplifier output terminal. The operational amplifier output terminal is coupled to the transistor input terminal, and the operational input terminals are coupled to the transistor output terminal. The output terminal of the high current drive bandgap based voltage regulator is coupled to the output of the high current drive transistor. The high current drive bandgap based voltage regulator is operable to provide a current of at least 100 μA to the output terminal while maintaining the output voltage at the output terminal at a value substantially equal to the designed output voltage value.12-18-2008
20110006749Startup circuit for bandgap voltage reference generators - Systems and methods to achieve a startup circuit of bandgap voltage reference generator circuits monitoring a current flow in the bandgap voltage reference generator circuit have been achieved. The startup circuit can operate at supply voltages of about one threshold voltage and is therefore appropriate for low voltage applications. The monitoring of a current through an electrical component inside the bandgap voltage reference generator circuit by replication the component branch in a scaled version saves power and does not disturb the normal operation of the current-mode bandgap voltage reference generator. The startup circuit invented can be applied for current-mode bandgap voltage reference generator circuits as well as for voltage-mode bandgap voltage reference generator circuits.01-13-2011
20090033310VOLTAGE REGULATOR - A voltage regulator. A pass element has a control gate and outputs an output voltage according to an input voltage and a control signal received from the control gate. A feedback circuit generates a feedback signal according to the output voltage. A bandgap circuit generates a reference voltage according to the output voltage. An amplifier generates a first signal according to the feedback signal and the reference voltage. A start-up circuit generates the control signal according to the reference voltage and the first signal.02-05-2009
20130119967BANDGAP REFERENCE CIRCUIT AND POWER SUPPLY CIRCUIT - A BGR circuit includes a first bipolar transistor and a second bipolar transistor that are connected between a power supply terminal and a ground terminal, each base of the first bipolar transistor and the second bipolar transistor being connected to an output terminal. A first resistor is connected between the ground terminal and the first bipolar transistor. A second resistor and a third resistor are connected in series between the first resistor and the second bipolar transistor. A temperature correction circuit is connected between the ground terminal and a node between the second resistor and the third resistor, and includes a first transistor having a base connected to an end of the first bipolar transistor of the first resistor. The temperature correction circuit further includes a fourth resistor connected in series to the first transistor.05-16-2013
20110215789BANDGAP REFERENCE CIRCUIT AND METHOD FOR PRODUCING THE CIRCUIT - Bandgap reference circuit, comprising a voltage generator (VG) designed to produce a voltage or a current proportional to absolute temperature, a supply circuit (SC), designed to produce a supply for operating the voltage generator (VG), comprising a bias element (BS) and a control element (CS), and a bias circuit (BC), designed to produce a bias for operating the voltage generator (VG), comprising a bias element (BB) and a control element (CB). At least one of the control element (CS) of the supply circuit (SC) and the control element (CB) of the bias circuit (BC) comprises a pseudomorphic high-electron-mobility transistor or a hetero-junction bipolar transistor and/or at least one of the bias element (BS) of the supply circuit (SC) and the bias element (BB) of the bias circuit (BC) comprises a long-gate pseudomorphic high-electron-mobility transistor or a resistor. Method for producing the circuit wherein the pseudomorphic high-electron-mobility transistors and the hetero-junction bipolar transistors are produced using a GaAs BiFET technology process.09-08-2011
20090160419START-UP CIRCUIT FOR REFERENCE VOLTAGE GENERATION CIRCUIT - Embodiments relate to a start-up circuit for a reference voltage generation circuit. According to embodiments, a start-up circuit may include a start-up start unit allowing current to flow in the reference voltage generation circuit to initiate a start-up process in response to a start-up start signal, a reference current generation unit decreasing a variable voltage depending on whether the reference voltage generation circuit is started up and generating start-up reference current corresponding to the variable voltage, and a start-up controller detecting current flowing in the reference voltage generation circuit, comparing the detected result with the start-up reference current, and outputting the compared result as a start-up start signal. Current consumption may be decreased after start-up. A BRG circuit may be stably started up. If a high supply voltage is used, current consumption may decrease, and if a low supply voltage is used, a BGR circuit may be stably started up.06-25-2009
20090091311CIRCUIT FOR GENERATING REFERENCE VOLTAGE OF SEMICONDUCTOR MEMORY APPARATUS - A reference voltage generating circuit in a semiconductor memory apparatus comprises a driving control signal generating unit configured to generate a driving control signal according to a temperature variation, wherein the driving control signal generating unit is enabled in response to a power-up signal, a driving unit configured to control a voltage level, which is applied to a voltage transfer node, in response to the power-up signal and the driving control signal, and a reference voltage generating unit configured to generate a reference voltage when a voltage level on the voltage transfer node is higher than a predetermined voltage level.04-09-2009
20120139523REFERENCE CURRENT OUTPUT DEVICE AND REFERENCE CURRENT OUTPUT METHOD - A reference current output device and reference current output method that may adjust a reference current while maintaining a temperature gradient. In the reference current output device and reference current output method of the present invention, a reference current is outputted by a reference voltage and current output circuit, a reference voltage outputted from the reference voltage and current output circuit is converted to an adjustment current and outputted by a conversion and output circuit, the adjustment current is superimposed with the reference current and a superimposed current is outputted by a superimposition and output section.06-07-2012
20120068685CIRCUIT AND METHOD FOR GENERATING REFERENCE VOLTAGE AND REFERENCE CURRENT - A circuit for generating reference voltage and reference current includes a band-gap reference circuit and a voltage-to-current converting circuit. The band-gap reference circuit is configured to generate a temperature-independent reference voltage by generating a first current with a positive temperature coefficient. The voltage-to-current converting circuit is coupled to a node of the band-gap reference circuit and configured to convert a voltage with a negative temperature coefficient at the node into a second current with a negative temperature coefficient. The band-gap reference circuit and the voltage-to-current converting circuit share a common current source having a feedback transistor through which a reference current flows. The reference current is divided into the first current of the band-gap reference circuit and the second current of the voltage-to-current converting circuit, thus having a temperature coefficient substantially equal to zero by combining the first current and the second current.03-22-2012
20090051342BANDGAP REFERENCE CIRCUIT - A bandgap reference circuit includes an input circuit having a first FET, a second FET, and a first resistor, wherein a first node is connected to the first FET having a first threshold voltage, the first resistor is connected between a second node and the second FET having a second threshold voltage; a mirroring circuit for controlling two output currents respectively derived from the first and second nodes, and maintaining the two output currents to a specific current ratio; and an operation amplifier connected to the first node, the second node of the input circuit, and the mirroring circuit, for controlling two voltages respectively at the first and second nodes of the input circuit to a specific voltage ratio; wherein the first FET and the second FET are both operating in the subthreshold region, the first threshold voltage is larger than the second threshold voltage, and the two output currents are independent of temperature.02-26-2009
20090085549BANDGAP REFERENCE CIRCUIT WITH REDUCED POWER CONSUMPTION - A bandgap voltage reference circuit and methods for generating a bandgap reference voltage are disclosed. An operational amplifier receives first and second input voltages from a first and second current path, respectively. A buffer stage is coupled to an output of the operational amplifier and generates third and fourth voltages on the first and second path. A temperature dependent current is generated using the third and fourth voltages in combination with a first diode, second diode and a resistor. A third current path mirrors the temperature dependent current and a temperature independent voltage is generated for the bandgap reference voltage in the third current path using the temperature dependent current in combination with a second resistor and related diode.04-02-2009
20110127987CIRCUITS AND METHODS TO PRODUCE A BANDGAP VOLTAGE WITH LOW-DRIFT - In accordance with an embodiment of the present invention, a bandgap voltage reference circuit includes a group of X current sources, a plurality of circuit branches, and a plurality of switches. Each of the X current sources (where X≧3) produces a corresponding current that is substantially equal to the currents produced by the other current sources within the group. The plurality of circuit branches of the bandgap voltage reference circuit are collectively used to produce a bandgap voltage output (VGO). Each of the plurality of circuit branches receives at least one of the currents not received by the other circuit branches. The plurality of switches (e.g., controlled by a controller) selectively change over time which of the currents produced by the current sources are received by which of the plurality of circuit branches of the bandgap voltage reference circuit.06-02-2011
20100156384METHODS AND APPARATUS FOR HIGHER-ORDER CORRECTION OF A BANDGAP VOLTAGE REFERENCE - Methods and apparatus for higher-order correction of bandgap voltage references are disclosed. An example bandgap voltage reference circuit disclosed herein comprises a bandgap voltage generation circuit comprising a first resistor, the bandgap voltage generation circuit configured to generate a proportional-to-absolute-temperature current to drive the first resistor to produce a first voltage, the first voltage contributing to an output bandgap voltage, and a first correction circuit electrically coupled to the first resistor and configured to provide a first correction current, the first correction circuit comprising a first nonlinear device configured to generate the first correction current only within a first temperature range, the first correction current decreasing with increasing temperature, the first correction current to drive the first resistor to increase the first voltage only within the first temperature range.06-24-2010
20100148744STARTER CIRCUIT, BANDGAP CIRCUIT AND MONITORING CIRCUIT - Embodiments according to the present invention relate to a bandgap circuit, a starter circuit and a monitoring circuit for a bandgap circuit comprising a bandgap reference circuit comprising a first branch and a second branch, the first branch comprising a first node, the second branch comprising a second node, such that a potential at the first node is equal to a potential at the second node in an equilibrium of the bandgap reference circuit. The bandgap reference circuit further comprises a feedback node for a feedback signal and a feedback circuit coupled to the first and second nodes and adapted to provide a feedback signal to the feedback node based upon a comparison of the potentials at the first and second nodes.06-17-2010
20100156386REFERENCE VOLTAGE CIRCUIT - Provided is a reference voltage circuit capable of generating a temperature-independent reference voltage more stably. Each of N-type metal oxide semiconductor (NMOS) transistors (06-24-2010
20090121701BANDGAP REFERENCE GENERATING CIRCUIT - A bandgap reference generating circuit includes an operational amplifier configured to generate a bandgap reference voltage; and a gain controller configured to control a gain of the operational amplifier with different values in a normal mode and a low power mode.05-14-2009
20100188067Current Calibration Method and Associated Circuit - A current calibration method and the associated control circuit are provided. The method includes: providing a predetermined voltage to the differential output for obtaining an accurate current passing through the panel resistor during a calibration procedure and, providing a driving current to the differential output according to the accurate current during a normal operation procedure.07-29-2010
20100156385Multi-Mode Amplifier - An amplifier capable of operating in multiple modes may include (a) first and second voltage inputs and (b) first and second current outputs that have substantially the same amplitude and polarity. Preferably, the inputs and outputs of the amplifier will have high impedances. The amplifier may operate in a first mode—and function as an operational amplifier—when the first and second current outputs are coupled together. The amplifier may operate in a second mode—and function as a type-2 current conveyor—when the second current output is coupled to the second voltage input. The amplifier may additionally include a third current output that has an amplitude that is substantially the same as the amplitudes of the first and second outputs and a polarity that is substantially opposite to the polarities of the first and second outputs. In this configuration the amplifier may function as a four-terminal floating nullor.06-24-2010
20100237848REFERENCE CIRCUIT WITH START-UP CONTROL, GENERATOR, DEVICE, SYSTEM AND METHOD INCLUDING SAME - A reference generator circuit generates a reference signal for use by a regulator in generating operational power for circuits and devices. A start-up circuit includes a self-biased voltage reference and a differential amplifier configured to generate a start-up signal to induce current flow in response to the voltage independent reference during the start-up phase of the circuit and cease inducing the current flow following the start-up phase of the circuit. The reference signal is generated by receiving a supply voltage and inducing current flow into a node of a bandgap reference circuit during a start-up phase of the bandgap reference circuit and ceasing inducing the current flow following the start-up phase of the bandgap reference circuit.09-23-2010
20110109296Voltage Regulator Architecture - An integrated circuit includes a bandgap reference generator and a voltage regulator. The bandgap reference generator includes a first current path, and a first bipolar transistor with an emitter-collector path in the first current path. The voltage regulator includes a second current path, wherein the second current path mirrors the first current path; a resistor configured to receive a current of the second current path; a second bipolar transistor with a base and a collector of the second bipolar transistor being interconnected; and a third bipolar transistor connected in series with the second bipolar transistor and the resistor. A base and a collector of the third bipolar transistor are interconnected.05-12-2011
20100253314EXTERNAL REGULATOR REFERENCE VOLTAGE GENERATOR CIRCUIT - Disclosed is an external regulator reference voltage generator circuit that precisely controls the supply voltage applied to core logic to optimize the operational characteristics of the core logic 10-07-2010
20100219804METHODS AND APPARATUS FOR GENERATING VOLTAGE REFERENCES USING TRANSISTOR THRESHOLD DIFFERENCES - Methods and apparatus are described that develop a reference voltage that is based on a difference between a threshold voltage of a first transistor and a threshold voltage of a second transistor, and further based on a difference between a gate overdrive voltage of the first transistor and a gate overdrive voltage of the second transistor.09-02-2010
20090322305REFERENCE VOLTAGE CIRCUIT - The present invention provides a reference voltage circuit making use of a non-volatile and non-modifiable storage of an electric charge. A tunable transformation module is adapted to transform a constant voltage corresponding to the constant stored charge into an output reference voltage. Further, a control loop provides tuning of the transformation module by means of an external calibration module with respect to a high precision reference voltage source. During a calibration procedure the transformation module is tuned in such a way that the output reference voltage equals the high precision reference voltage. After disconnecting reference voltage electronic circuit and calibration module, the output reference voltage is governed by the charge stored by means of the non-volatile storage and by the configuration of the tunable transformation module. It remains constant and accurate with respect to time and temperature and consumes only a minimum of electric current.12-31-2009
20080303504Semiconductor device - A semiconductor device includes: a first reference voltage generator for generating a first reference voltage; a first band gap circuit for dividing a voltage at a second reference voltage output node to produce a first and a second band gap voltages having a property relative to temperature variations; a first comparator for receiving the first reference voltage as a bias input and comparing the first band gap voltage with the second band gap voltage; and a first driver for pull-up driving the second reference voltage output node in response to an output signal of the first comparator.12-11-2008
20100295529CHOPPER STABILIZED BANDGAP REFERENCE CIRCUIT AND METHODOLOGY FOR VOLTAGE REGULATORS - A chopper stabilized bandgap voltage reference circuit comprises current mirror circuitry mirroring first and second currents into first and second networks to generate a forward diode voltage signal and a PTAT (proportional to absolute temperature) component signal, and a third current having a derived temperature coefficient into a third network to generate a reference voltage signal for a regulator. An amplifier amplifies a differential signal of the forward diode voltage signal and the PTAT component signal to output a fourth current to control the first and second currents. According to a chopper clock, a modulator modulates the differential signal to be supplied to the amplifier and a demodulator demodulates the fourth current. A gain loop compensation circuit is coupled to the demodulator to compensate the amplifier, and filter the fourth current for noise components, and a bypass circuit is also provided to the third network for filtering the third current.11-25-2010
20090021234Ultra low-voltage sub-bandgap voltage reference generator - A low-voltage sub-bandgap reference circuit is disclosed. In one embodiment, the low-voltage sub-bandgap voltage reference circuit includes a differential amplifier and a first bipolar transistor with its base and collector coupled to an electrical ground. The reference circuit further includes a second bipolar transistor with base and collector coupled to the electrical ground. The reference circuit further includes a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high voltage terminal being coupled to both collectors of the first and second bipolar transistors and the low voltage terminal being coupled to both bases of the first and second bipolar transistors.01-22-2009
20100134087LOW NOISE REFERENCE CIRCUIT OF IMPROVING FREQUENCY VARIATION OF RING OSCILLATOR - A low noise reference voltage circuit without using an amplifier inside is capable of transforming a current I06-03-2010
20090167281BANDGAP REFERNCE VOLTAGE GENERATING CIRCUIT - A bandgap reference voltage generating circuit, includes: at least two bipolar transistors; an operational amplifier; a first PMOS transistor; and a second PMOS transistor whose source is connected to the upper limit power supply voltage and which supplies the reference current to the bipolar transistors. Further, the bandgap reference voltage generating circuit includes a third PMOS transistor whose source is connected to the upper limit power supply voltage; a fourth PMOS transistor whose source is connected to the upper limit power supply voltage and gate is connected to a drain of the third PMOS transistor; a first NMOS transistor whose source is connected to the lower limit power supply voltage and drain is connected to a drain of the fourth PMOS transistor; and a second NMOS transistor whose drain is connected to the operational amplifier and gate is connected to the drain of the first NMOS transistor.07-02-2009
20110127988ROTATING GAIN RESISTORS TO PRODUCE A BANDGAP VOLTAGE WITH LOW-DRIFT - In accordance with an embodiment of the present invention, a bandgap voltage reference circuit includes a plurality of circuit branches, a plurality of resistors and a plurality of switches. The plurality of switches are used to selectively change over time which of the resistors are connected to be within a first one of the circuit branches and which of the resistors are connected to be within a second one of the circuit branches, to thereby reduce the effects that long term drift of the resistors have on a bandgap voltage output (VGO) of the bandgap voltage reference circuit.06-02-2011
20110025291Start-Up Circuits for Starting Up Bandgap Reference Circuits - An integrated circuit structure includes a bandgap reference circuit and a start-up circuit. The bandgap reference circuit includes a positive power supply node and a PMOS transistor including a source coupled to the positive power supply node. The start-up circuit is configured to be turned on during a start-up stage of the bandgap reference circuit, and to be turned off after the start-up stage. The start-up circuit includes a switch configured to interconnect a gate and a drain of the PMOS transistor during the start-up stage, and to disconnect the gate of the PMOS transistor from the drain of the PMOS transistor after the start-up stage.02-03-2011
20110043185CURRENT REFERENCE CIRCUIT - A current reference circuit includes a proportional-to-absolute temperature (PTAT) current generator, a band-gap reference circuit and a current replication circuit. The PTAT generator generates a PTAT current. The band-gap reference circuit generates a reference voltage based on the PTAT current and generates a second current by cancelling a first current from the PTAT current. The first current has a zero temperature coefficient and the second current has a positive temperature coefficient. The current replication circuit replicates the first current based on the PTAT current and the second current.02-24-2011
20110241646Low Noise Bandgap References - Low noise bandgap voltage references using a cascaded sum of bipolar transistor cross coupled loops. These loops are designed to provide the total PTAT voltage necessary for one and two bandgap voltage references. The PTAT voltage noise is the square root of the sum of the squares of the noise voltage of each transistor in the loops. The total noise of the reference can be much lower than approaches using two or 4 bipolar devices to get a PTAT voltage and then gaining this PTAT voltage to the required total PTAT voltage. The cross coupled loops also reject noise in the current that bias them. Alternate embodiments are disclosed.10-06-2011
20110084681CIRCUITS AND METHODS TO PRODUCE A VPTAT AND/OR A BANDGAP VOLTAGE WITH LOW-GLITCH PRECONDITIONING - Provided herein are circuits and methods to generate a voltage proportional to absolute temperature (VPTAT) and/or a bandgap voltage output (VGO) with low 1/f noise. A first base-emitter voltage branch is used to produce a first base-emitter voltage (VBE04-14-2011
20110175593BANDGAP VOLTAGE REFERENCE CIRCUIT AND INTEGRATED CIRCUIT INCORPORATING THE SAME - A bandgap voltage reference circuit is provided with: a feedback circuitry, first and second PN junction elements and first and second resistor elements. The feedback circuitry provides a feedback so as to reduce a voltage between first and second nodes. The first PN junction element is connected between the first node and a ground terminal so as to allow a first current from the first node to the ground terminal to flow in a forward direction of a PN junction. The second PN junction element is connected between the first node and a ground terminal so as to allow a first current from the first node to the ground terminal to flow in a forward direction of a PN junction. The first resistor element is connected between the first node and the first PN junction element, and a second resistor element is connected between the second node and the second PN junction element.07-21-2011
20090027031Low noise bandgap voltage reference - A bandgap voltage reference circuit that can be implemented with low noise characteristics is described. To achieve such low noise, a bandgap reference circuit is provided that includes an amplifier coupled at its inputs to first and second transistors respectively, the transistors being arranged to generate a voltage representative of the base emitter voltage differences between each of the first and second transistors across a sensing resistor. The circuit additionally provides an additional current to the sensing resistor to reduce the noise contribution into the amplifier from the first transistor. Such a circuit may be corrected for second order temperature effects by inclusion of a temperature dependent current source.01-29-2009
20080309309Bias circuit - In a conventional bias circuit, as a power supply voltage increases, a current supplied to a bandgap reference becomes unstable due to a fluctuation of the power supply voltage, which makes it impossible for the bias circuit to perform stable bias operations in some cases. A bias circuit of the present invention has a bandgap reference, and includes a first current path supplying a drive current to the bandgap reference, and a second current path supplying a current to the bandgap reference for a predetermined period of time after power-on.12-18-2008
20110260708Bandgap reference circuit and method - A circuit for generating a band gap reference voltage (V10-27-2011
20110148389STABLE VOLTAGE REFERENCE CIRCUITS WITH COMPENSATION FOR NON-NEGLIGIBLE INPUT CURRENT AND METHODS THEREOF - A voltage reference circuit includes three or more current mirrors, an operational amplifier, a voltage buffer, two or more diodes, and one or more resistors. The operational amplifier has two inputs separately coupled to an output of two of the three or more current mirrors and an output coupled to the three current mirrors. The voltage buffer has an input coupled to an output of the other one of the three or more current mirrors and another input coupled to an output of the voltage buffer. Each of the diodes is coupled between the output of the two of the three or more current mirrors and one of ground and a negative supply. The one or more resistors are coupled to an output of one or more of the three or more current mirrors to tune effects of input current and establish a first set absolute voltage and temperature coefficient on a voltage reference.06-23-2011
20110148388RADIATION TOLERANT CIRCUIT FOR MINIMIZING THE DEPENDENCE OF A PRECISION VOLTAGE REFERENCE FROM GROUND BOUNCE AND SIGNAL GLITCH - A radiation-hardened reference circuit includes a precision voltage reference circuit for generating a current-controlling voltage at first and second terminals, a driver circuit for receiving the current-controlling voltage at first and second terminals and for generating an output reference voltage, and a differential sampling circuit having first and second input terminals coupled to the first and second terminals of the voltage reference circuit, and first and second output terminals coupled to the first and second terminals of the driver circuit.06-23-2011
20100052643BAND-GAP REFERENCE VOLTAGE GENERATOR - A band-gap reference voltage generator is provided. N-channel metal oxide semiconductor (NMOS) transistors are respectively connected to bipolar transistors in parallel. A Complementary To Absolute Temperature (CTAT) voltage that is inversely proportional to absolute temperature is reduced by a threshold voltage of the NMOS transistor. A weight for a temperature coefficient of a Proportional To Absolute Temperature (PTAT) voltage that is directly proportional to absolute temperature is reduced and a resistance ratio for a temperature coefficient of 0 is reduced by about 03-04-2010
20090051341BANDGAP REFERENCE CIRCUIT - A bandgap reference circuit includes a PTAT current generating circuit for generating a PTAT current; a CTAT circuit generating circuit for generating a CTAT current; a node for receiving the PTAT current and the CTAT current; and, a first resistor connected between the node and a ground, wherein a reference voltage is derived from the first resistor when a superposed current of the PTAT current and the CTAT current is flowing through the first resistor.02-26-2009
20110068767SUB-VOLT BANDGAP VOLTAGE REFERENCE WITH BUFFERED CTAT BIAS - Circuits, methods, and apparatus that provide voltage references having a temperature independent output voltage that is less then the bandgap of silicon. The temperature coefficient and absolute voltage can be independently adjusted. One example generates two voltages, the first of which is proportional-to-absolute temperature and the second of which is complementary-to-absolute temperature. These voltages are placed across a first resistor. The first resistor is further connected to a second resistor to form a resistor divider. The resistor divider provides a reduced voltage that is below that bandgap of silicon. The temperature coefficient of the reference voltage provided by the resistor divider can be set by adjusting the first resistor. The absolute voltage provided can be set by adjusting the second resistor.03-24-2011
20110068766REFERENCE VOLTAGE GENERATORS, INTEGRATED CIRCUITS, AND METHODS FOR OPERATING THE REFERENCE VOLTAGE GENERATORS - A reference voltage generator includes a proportional to absolute temperature (PTAT) current source and a voltage divider. The PTAT current source is capable of providing a first current that is proportional to a temperature. The voltage divider is capable of receiving a second current that is proportional to the first current. The voltage divider is capable of outputting a reference voltage. The reference voltage is substantially independent from a change of the temperature.03-24-2011
20110068765SYSTEM AND METHOD FOR POWER CALIBRATING A PULSE GENERATOR - An apparatus is disclosed for generating an output signal (e.g., a defined pulse), including a power or current calibration feature. The apparatus comprises a current source adapted to generate a first current to produce the output signal, a current sampling module adapted to generate a second current as a function of (e.g., substantially proportional or equal to) the first current, a reference current module (e.g., a bandgap current source) adapted to generate a third current, and a calibration module adapted to calibrate the first current based on the second and third currents. The current source comprises a plurality of selectable current paths. The current sampling module comprises a replica of at least a portion of one or more current paths of the current source. The calibration module may perform a calibration in response to a defined time, an environment parameter (temperature, voltage, pulse repetition frequency, amplitude requirement change, etc.), or the output signal not being generated.03-24-2011
20110050197Reference current or voltage generation circuit - A reference current or voltage generation circuit which forms a self feedback circuit with a plurality of transistors and generates a reference current or a reference voltage, the reference current or voltage generation circuit including a normally-on type transistor that has a gate connected to a first power supply and is connected between a node and a second power supply. Moreover, a voltage of the node is substantially equal to a voltage of the first power supply when the reference current or voltage generation circuit does not operate, and the voltage of the node fluctuates from the voltage of the first power supply toward a voltage of the second power supply by a predetermined value or more when the reference current or voltage generation circuit operates.03-03-2011
20080238400Bandgap voltage and current reference - Circuits and methods that improve the performance of reference circuits are provided. A reference generator circuit maintains a substantially constant output current over an extended temperature for use as a reference. Output current fluctuations caused by a poorly specified power source or process variations are minimized or eliminated.10-02-2008
20110101954REFERENCE SIGNAL GENERATOR AND METHOD FOR PROVIDING A REFERENCE SIGNAL WITH AN ADAPTIVE TEMPERATURE COEFFICIENT - A voltage source provides a first voltage which is independent of temperature variation and variable, and a voltage step-down circuit provides a second voltage to be subtracted from the first voltage to generate a reference signal. The second voltage has a first temperature coefficient, and the reference signal has a second temperature coefficient. By changing the first voltage, the second temperature coefficient changes accordingly.05-05-2011
20120043955Bandgap Reference Circuit and Bandgap Reference Current Source - The present invention provides a bandgap reference circuit. The bandgap reference circuit includes a first bipolar junction transistor, a first resistor, for generating a proportional to absolute temperature current, a second resistor, for generating a complementary to absolute temperature current, a first operational amplifier, coupled with the first bipolar junction transistor and the first resistor, a second operational amplifier, coupled with the first bipolar junction transistor and the second resistor, and a zero temperature correlated current generator, for summing the proportional to absolute temperature current and the complementary to absolute temperature current, to generate a zero temperature correlated current.02-23-2012
20110156690REFERENCE VOLTAGE GENERATION CIRCUIT - A first resistance element is coupled between a first rectifying element and an output node at which a reference voltage is generated. Second and third resistance elements are coupled in series between a second rectifying element and the output node. A differential amplifier outputs a control voltage corresponding to a difference between a first voltage generated at a connection point of the first rectifying element and the first resistance element and a second voltage generated at a connection point of the second resistance element and the third resistance element. A control circuit supplies a control current corresponding to the control voltage from the differential amplifier. A start-up circuit causes, by supplying a start-up current to the output node in response to supply of a power supply voltage, transition from a first stable state to a second stable state.06-30-2011
20120056609REFERENCE CURRENT GENERATION CIRCUIT - One embodiment provides a reference current generation circuit. The circuit has first and second reference current generation circuits for generating first and second reference currents respectively, and a current output circuit for outputting a third reference current by adding the first and second reference currents. The first reference current generation circuit includes first and second current-voltage conversion circuits and a first current supply circuit. The first current supply circuit provides substantially equal amounts of current to the first and second current-voltage conversion circuits respectively. The second reference current generation circuit includes third to fifth current-voltage conversion circuits and a second current supply circuit. The second current supply circuit provides a current to the fourth current-voltage conversion circuit, divide and provide amounts of current substantially equal to that of the current provided to the fourth current-voltage conversion circuit, to the third and fifth current-voltage conversion circuits respectively.03-08-2012
20090027030Low noise bandgap voltage reference - A bandgap voltage reference circuit that can be implemented with low noise characteristics is described. To achieve such low noise, a bandgap reference circuit is provided that includes an amplifier coupled at its inputs to first and second transistors respectively, the transistors being arranged to generate a voltage representative of the base emitter voltage differences between each of the first and second transistors across a sensing resistor. The circuit additionally provides an additional current to the sensing resistor to reduce the noise contribution into the amplifier from the first transistor. Such a circuit may be corrected for second order temperature effects by inclusion of a temperature dependent current source.01-29-2009
20120206123EDGE RATE CONTROL GATE DRIVER FOR SWITCHING POWER CONVERTERS - This document discusses, among other things, apparatus and methods for an edge rate driver for a power converter switch. In an example, the driver can include an input node configured to receive a pulse width modulated signal, a first switch configured to couple a control node of the power converter switch to a supply voltage during a first state, a second switch configured to couple the control node of the power converter switch to a reference voltage during a second state, and a first current source configured to supply charge current to the first switch when the power converter switch transitions from the second state to the first state, the charge current configured to charge a parasitic capacitance of the power converter switch.08-16-2012
20120025801REFERENCE CURRENT SOURCE CIRCUIT INCLUDING ADDED BIAS VOLTAGE GENERATOR CIRCUIT - A MOS resistor generates an output current based on a voltage induced across a drain and a source thereof. A gate bias voltage generator circuit generates a gate bias voltage so as to operate the MOS resistor in a strong-inversion linear region, and applies the gate bias voltage to a gate of the MOS resistor. A drain bias voltage generator circuit generates a drain bias voltage, and applies the drain bias voltage to the drain of the MOS resistor. An added bias voltage generator circuit generates an added bias voltage, which has a predetermined temperature coefficient and includes a predetermined offset voltage, so that the output current becomes constant against temperature changes. The drain bias voltage generator circuit adds the added bias voltage to the drain bias voltage, and applies a voltage of adding results to the drain of the MOS resistor as the drain bias voltage.02-02-2012
20120119724CURRENT GENERATING CIRCUIT - A first current source generates a first current having positive temperature characteristics. A second current source generates a second current. A first current mirror circuit generates a third current by multiplying, by a first coefficient, the base current of a compensation transistor configured as an NPN bipolar transistor arranged on a path of the second current. A second current mirror circuit generates a fourth current that is proportional to the difference between the first current and the third current. A current generating circuit outputs the sum total of the fourth current and a fifth current that is proportional to the base current.05-17-2012
20120249115BANDGAP REFERENCE CIRCUIT - A bandgap reference circuit includes a modulator, an amplifier, a demodulator, a closed feedback loop and an output circuit. The modulator is utilized for modulating an input signal to generate a modulated input signal. The amplifier is utilized for amplifying the modulated input signal to generate an amplified modulated input signal. The demodulator is utilized for demodulating the amplified modulated input signal to generate a demodulated signal. The closed feedback loop is coupled between an output terminal of the demodulator and an input terminal of the modulator. The output circuit is utilized for generating an output current according to the demodulated signal, where the output current is a constant current insensitive to fluctuations in temperature.10-04-2012
20120249117VOLTAGE REGULATOR - A voltage regulator is capable of continuously and smoothly preventing an inrush current independently of a startup characteristic of a reference voltage circuit. The voltage regulator is provided with an inrush current protection circuit composed of a constant-current circuit, a first transistor having the source thereof connected to the constant-current circuit and the gate thereof controlled by an output voltage detection circuit, a capacitor connected between the first transistor and the gate of an output transistor, a second transistor having the gate thereof connected to the drain of the first transistor and the source thereof connected to a power supply terminal, and a third transistor, which is connected between the second transistor and the output transistor and the gate of which is controlled by the output voltage detection circuit.10-04-2012
20120249116SELF-SUSTAINING, HIGH VOLTAGE TOLERANT POWER SUPPLY - A power supply system is provided that provides voltage clamping capabilities to provide over voltage protection to circuit elements and circuit systems. The power supply includes isolation mechanisms that generate a regulated power supply that is independent of an input power source. Voltage addition/multiplication techniques may be utilized to generate a reference voltage, from the regulated power supply, that is capable of setting a maximum voltage on a clamped power supply. The power supply system may operate without input from other circuits/systems associated with an integrated circuit.10-04-2012
20120161743REGULATION DEVICE AND POWER ADAPTER USING THE SAME - A power adapter includes a regulation device, which includes a division circuit, a reference circuit, and an impedance regulation circuit. The division circuit includes a first reference terminal and a second reference terminal. The second reference terminal is connected to an output terminal of the regulation device. The reference circuit includes a third reference terminal connected to the first reference terminal, and the reference circuit outputs a stable reference voltage via the third reference terminal, to provide the stable reference voltage for the first reference terminal. The impedance regulation circuit is connected to the first reference terminal, to provide equivalent impedance for the first reference terminal. The impedance of the equivalent impedance changes in a way corresponding to changes in the current flowing through the output terminal.06-28-2012
20120161744REFERENCE VOLTAGE GENERATING APPARATUS AND METHOD - A method and apparatus for generating a low reference voltage having low power consumption characteristics is provided. A reference voltage generating apparatus includes a constant current source circuit which generates a reference current. A load circuit is connected to the constant current source circuit and generates a voltage which is proportional to the reference current. A current branch circuit removes a portion of temperature-invariant current components included in the reference current from a connection terminal of the constant current source circuit and the load circuit to a ground terminal through a current branch which is different from a current branch of the load circuit.06-28-2012
20090039861REFERENCE VOLTAGE GENERATOR PROVIDING A TEMPERATURE-COMPENSATED OUTPUT VOLTAGE - The present invention concerns a reference voltage generator (02-12-2009
20100207597Bandgap Reference Circuit with an Output Insensitive to Offset Voltage - A circuit includes an operational amplifier including a first input and a second input. A first resistor has a first end coupled to the first input. A first bipolar transistor includes a first emitter coupled to a second end of the first resistor, and a first base. A second bipolar transistor includes a second emitter coupled to the second input, and a second base. A third bipolar transistor includes a third emitter coupled to the first base, a first collector, and a third base connected to the first collector. A fourth bipolar transistor includes a fourth emitter coupled to the second base, a second collector, and a fourth base connected to the second collector. A second resistor is coupled to the first input, wherein the second resistor is parallel to the first resistor and the first bipolar transistor.08-19-2010
20120212208Bandgap Reference Circuit with an Output Insensitive to Offset Voltage - A method includes generating a first current, wherein the first current flows through a first resistor and a first bipolar transistor. A first end of the first resistor is serially connected to an emitter-collector path of the first bipolar transistor, and a second end of the resistor is connected to an input of an operational amplifier. A second current is generated to flow through a second resistor that is connected to the input of the operational amplifier. An emitter of a second bipolar transistor is connected to a base of the first bipolar transistor, wherein a base and a collector of the second bipolar transistor are connected to VSS. The first and the second currents are added to generate a third current, which is mirrored to generate a fourth current proportional to the third current. The fourth current is conducted through a third resistor to generate an output reference voltage.08-23-2012
20120212207Bandgap Circuit and Complementary Start-Up Circuit for Bandgap Circuit - A bandgap circuit includes a bias current generating circuit and a complementary start-up circuit. The bias current generating circuit includes a first node and a second node and is arranged to generate a bias current in response to a voltage provided at the first node or a voltage provided at the second node. The complementary start-up circuit is arranged to start-up the bias current generating circuit and includes a first start-up circuit coupled to the first node and a second start-up circuit coupled to the second node. The first and second start-up circuits operate complementarily, so that the second start-up circuit provides the voltage to the second node when the first start-up circuit is unable to provide the voltage to the first node, and the first start-up circuit provides the voltage to the first node when the second start-up circuit is unable to provide the voltage to the second node.08-23-2012
20090058391TEMPERATURE SENSITIVE CIRCUIT - A circuit for use in a current source or a proportional to absolute temperature sensor or in a bandgap regulator, the circuit comprising at least two PTAT cells the operating Voltages of whose components overlap, the PTAT contribution to the output including the sum of the outputs of the two PTAT cells.03-05-2009
20090058390SEMICONDUCTOR DEVICE WITH COMPENSATION CURRENT - A semiconductor device is disclosed. In one embodiment, the semiconductor device includes a first resistor, a second resistor, and a transistor. The second resistor is configured to receive a current via the first resistor. The transistor is configured to be driven via the first resistor and the second resistor and provide a compensation current. The current includes the compensation current and a reference current and changes in the current are compensated for via the compensation current which limits changes in the reference current.03-05-2009
20100052644BANDGAP REFERENCE CIRCUIT AND METHOD OF STARTING BANDGAP REFERENCE CIRCUIT - In accordance with a bandgap circuit and a method of starting the bandgap circuit, a start signal is continuously supplied to a differential amplifier circuit to start up the differential amplifier circuit that controls a bandgap core circuit until the differential amplifier circuit has started up, and then the supply of the start signal to the differential amplifier circuit is discontinued after the differential amplifier circuit has started up.03-04-2010
20120176118VOLTAGE DOWN CONVERTER FOR HIGH SPEED MEMORY - A voltage down converter (VDC) applicable to high-speed memory devices. The VDC includes a steady driver and active driver along with at least one additional transistor. The steady driver and active driver are coupled by a transistor switch during device start-up to provide fast ramp-up to operating voltage and current. After start-up, the steady driver and active drive function to maintain a steady operating voltage and current. An additional transistor is digitally controlled to drive up operating voltage and current upon issuance of an active command representing read, write, and/or refresh of memory. In this manner, the additional transistor provides fast compensation for fluctuations in operating voltage and current brought on by activity in the memory array.07-12-2012
20120229117Startup circuit for low voltage cascode beta multiplier current generator - A self-biased reference circuit device (09-13-2012
20110121809VOLTAGE REFERENCE CIRCUIT - A bandgap voltage reference unit on an integrated circuit (05-26-2011
20100327842REFERENCE VOLTAGE GENERATOR HAVING A TWO TRANSISTOR DESIGN - An improved voltage reference generator is provided. The voltage reference generator comprises: a first transistor having a gate electrode biased to place the first transistor in a weak inversion mode; and a second transistor connected in series with said first transistor and having a gate electrode biased to place the second transistor in a weak inversion mode, where the threshold voltage of the first transistor is smaller than the threshold voltage of the second transistor and the gate electrode of the second transistor is electrically coupled to a drain electrode of the second transistor and the source electrode of the first transistor to form an output for a reference voltage.12-30-2010
20080297132REFERENCE VOLTAGE GENERATOR AND VOLTAGE REGULATOR INCORPORATING SAME - A reference voltage generator includes a first field effect transistor with n-type heavily doped gate structure and a second field effect transistor with p-type heavily doped gate structure. The first transistor is configured to have a gate and a substrate gate connected to ground, one terminal connected to a voltage supply, and another terminal connected to an output node. The second transistor is configured to have a gate and one terminal connected to the output node, and a substrate gate and another terminal connected to ground. The output node outputs a given reference voltage when voltage is supplied from the voltage supply. A voltage regulator that generates a constant voltage based on a given reference voltage incorporates the reference voltage generator.12-04-2008
20080297131BANDGAP REFERENCE CIRCUIT - A bandgap reference circuit includes a reference current generator for respectively generating a first reference current on a first current path and a second reference current on a second current path, a current mirror for generating a third reference current on a third current path based on the first and second reference currents, an operation amplifier for rendering the first reference current substantially identical to the second reference current and a feedback circuit for rendering a node voltage on the first current path substantially identical to another node voltage on the third current path, so as to eliminate possible errors caused by a channel length modulation effect in the current mirror.12-04-2008
20080297130BANDGAP REFERENCE CIRCUITS - A bandgap reference circuit comprises: a current generator for generating an output current, the current generator comprising a first reference unit and a plurality of second reference units arranged in parallel, where the current generator is capable of determining the magnitude of the output current according to the reference units; a first resistor, coupled between a first terminal of the first reference unit and a node, for transmitting a first current; a second resistor, coupled to the node and a first terminal of each second reference unit, for transmitting a second current; a third resistor, coupled between the node and an output terminal of the bandgap reference circuit, for transmitting a third current; and a current-to-voltage converter, coupled to the third resistor, for generating a bandgap voltage according to the output current and the third current.12-04-2008
20120262146REFERENCE-VOLTAGE GENERATION CIRCUIT - In a reference-voltage generation circuit using a diode, its temperature characteristics can be freely controlled. A regulating current supply section supplies a regulating current for regulating a diode current to an anode of one of a first or second diode. The regulating current supply section can change a magnitude of the regulating current, and can generate a current proportionate to a diode current of the other diode as the regulating current.10-18-2012
20120081099SUPPLY INVARIANT BANDGAP REFERENCE SYSTEM - An electronic reference-signal generation system includes a supply invariant bandgap reference system that generates one or more bandgap reference signals that are substantially unaffected by bulk error currents. In at least one embodiment, the bandgap reference generates a substantially invariant bandgap reference signals for a range of direct current (DC) supply voltages. Additionally, in at least one embodiment, the bandgap reference system provides substantially invariant bandgap reference signals when the supply voltage varies due to alternating current (AC) voltages. In at least one embodiment, the bandgap reference system generates a bandgap reference voltage VBG, a “proportional to absolute temperature” (PTAT) current (“i04-05-2012
20120326696VARIABLE VOLTAGE GENERATION CIRCUIT - A variable voltage generation circuit includes an amplifier, a P-type metal-oxide-semiconductor transistor, at least one variable resistor, and a lower resistor. Each variable resistor includes M resistors and M switches. An i12-27-2012
20120326695INTERMITTENTLY ACTIVATED BANDGAP REFERENCE CIRCUIT - A circuit for providing a reference voltage includes a bandgap reference circuit, a first unity gain buffer coupled to the bandgap reference circuit, a first switch for coupling a second reference voltage node to a third reference voltage node, a first capacitor coupled to the third reference voltage node, a second switch for coupling the third reference voltage node to a fourth reference voltage node, and a second capacitor coupled to the fourth reference voltage node, wherein during operation a fourth reference voltage at the fourth reference voltage node decays when the second capacitor discharges. A control circuit provides control signals for intermittently operating the bandgap reference circuit and for controlling the switches to recharge the second capacitor after the fourth reference voltage decays a predetermined amount.12-27-2012
20120326697Temperature Independent Reference Circuit - A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R12-27-2012
20100181986BANDGAP CIRCUIT WITH TEMPERATURE CORRECTION - A temperature corrected voltage bandgap circuit is provided. The circuit includes first and second diode connected transistors. A first switched current source is coupled to the one transistor to inject or remove a first current into or from the emitter of that transistor. The first current is selected to correct for curvature in the output voltage of the bandgap circuit at one of hotter or colder temperatures.07-22-2010
20130015835RIPPLE FREE BAND-GAP VOLTAGE GENERATOR IMPLEMENTING A CHOPPING TECHNIQUE AND RELATIVE METHODAANM CORRADI; StefanoAACI SiracusaAACO ITAAGP CORRADI; Stefano Siracusa ITAANM CRISTAUDO; DomenicoAACI Tremestieri EtneoAACO ITAAGP CRISTAUDO; Domenico Tremestieri Etneo ITAANM BATTAGLIA; DanieleAACI San Gregorio di Catania (CT)AACO ITAAGP BATTAGLIA; Daniele San Gregorio di Catania (CT) IT - A band-gap reference voltage generator for generating a stable band-gap reference voltage including a chopped band-gap circuit, a first sample and hold circuit coupled to the chopped band-gap circuit, a second sample and hold circuit coupled to the chopped band-gap circuit, and an output circuit coupled to the first and second sample and hold circuits for generating the stable band-gap reference voltage.01-17-2013
20130015834SYSTEM AND METHOD FOR POWER TRIMMING A BANDGAP CIRCUITAANM GLIBBERY; AdamAACI HantsAACO GBAAGP GLIBBERY; Adam Hants GB - Techniques to perform bandgap circuit trimming that maximize the operating range and minimize the trimming time at which the bandgap will be accurate. A bandgap circuit output voltage may be trimmed by heating the circuit, supplying increasing input power to the bandgap circuit, and adjusting operational parameters of the bandgap circuit to generate a constant bandgap circuit output voltage. When the bandgap circuit output voltage may remain constant, a constant input power may be applied to the bandgap circuit and its output voltage may be adjusted to a predetermined voltage level.01-17-2013
20120242317REFERENCE VOLTAGE CIRCUIT - Provided is a reference voltage circuit with improved temperature characteristics. A current based on a current flowing through a first depletion transistor whose gate and source are connected to each other is caused to flow through a third depletion transistor having the same threshold, to thereby generate a voltage between a gate and a source of the third depletion transistor. A current based on a current flowing through a second depletion transistor whose gate and source are connected to each other is caused to flow through a fourth depletion transistor having the same threshold, to thereby generate a voltage between a gate and a source of the fourth depletion transistor. A reference voltage is generated based on a difference voltage of the two voltages, to thereby obtain a reference voltage having less voltage fluctuations with respect to a temperature change.09-27-2012
20080231248FAST START-UP CIRCUIT BANDGAP REFERENCE VOLTAGE GENERATOR - A bandgap voltage reference circuit includes a bandgap voltage generation circuit that can produce a bandgap reference voltage in response to an activation voltage signal, a start-up circuit that can produce the activation voltage signal in response to one-shot voltage pulse and an one-shot pulse generator circuit configured to produce the one-shot voltage pulse. The start-up circuit can be automatically shut off after the one-shot voltage pulse.09-25-2008
20130169259System and Method for a Low Voltage Bandgap Reference - In accordance with an embodiment, a reference voltage generator includes a first current generator and a second current generator. The first current generator is configured to produce a first current proportional to a current through a first diode connected in series with the first resistance coupled between a first voltage and a second voltage, such that the first current is produced according to a first proportionality constant. The second current generator is configured to produce a second current proportional to a current through a second diode connected in series with the second resistance coupled between the first voltage and the second voltage, such that the second current is produced according to a second proportionality constant. The reference voltage generator further includes a reference resistor coupled to the first and second current generators and to and output of the reference voltage generator.07-04-2013
20080224682Voltage reference circuit - A reliable start-up circuit for starting a bandgap type voltage reference generator which ensures that the bandgap reference cell will operate at a stable operating point before the start-up circuit is disabled.09-18-2008
20130099770REFERENCE POWER SUPPLY CIRCUIT - A reference power supply circuit includes an adjustable resistance network and a bandgap reference power supply circuit, in which the adjustable resistance network includes a first resistor end and a second resistor end, the resistance between the first resistor end and the second resistor end varies with a process deviation; the bandgap reference power supply circuit connects the first resistor end with the second resistor end, for generating a positive proportional to absolute temperature current flowing through the first resistor end and the second resistor end and for outputting a reference voltage related to the positive proportional to absolute temperature current. The reference power supply circuit has the advantageous of high precision and good temperature drift characteristic.04-25-2013
20100308789BAND GAP REFERENCE VOLTAGE GENERATOR - A band gap reference voltage generator with low working voltage is disclosed. The band gap reference voltage generator can stably operates that the unexpected balance status does not occur due to the manufacturing process inaccuracy or the offset voltage. The band gap reference voltage generator comprises a thermal voltage generation circuit, a voltage level optimizing circuit and a band gap reference voltage generating circuit. The thermal voltage generating circuit provides a first voltage and a second voltage. The first voltage is for generating a current component increased with temperature rising. The second voltage is for generating a current component decreased with temperature rising. The voltage level optimizing circuit optimizes the voltage level of the second voltage to generate a third voltage. The band gap reference voltage generating circuit generates the reference voltage with a specific voltage level corresponding to the first voltage and the third voltage irrelevant with the temperature.12-09-2010
20100308788BAND-GAP VOLTAGE REFERENCE CIRCUIT - A band-gap voltage reference circuit comprising first and second branches respectively including first and second groups of transistors of different emitter current conduction areas and current sources for running the first and second groups of transistors at different emitter current densities to generate respective base-emitter voltages, and output terminals connected to receive a regulated voltage (Vout) which is a function of the base-emitter voltages of the first and second groups of transistors. Each of the first and second groups includes at least one npn-type transistor and at least one pnp transistor connected with their emitter-collector paths in series in the respective one of the branches so as to present cumulated base-emitter voltages across the respective group. The output voltage at the output terminals is responsive both to a difference (ΔVbep+n) between the cumulated base-emitter voltages of the first and second branches and to the cumulated base-emitter voltage (Vbep+n) of that one of the first and second groups with higher emitter current density.12-09-2010
20120274306METHOD AND CIRCUIT FOR LOW POWER VOLTAGE REFERENCE AND BIAS CURRENT GENERATOR - A system and method are provided for a PTAT cell with no resistors which can operate at low power, has less sensitivity to process variation, occupies less silicon area, and has low noise. Further, a system and method are provided to scale up the reference voltage and current through a cascade of unit cells. Still further, a system and method are provided for PTAT component to be fine-tuned, advantageously providing less process variability and less temperature sensitivity.11-01-2012
20110234197BANDGAP CIRCUIT WITH TEMPERATURE CORRECTION - A temperature corrected voltage bandgap circuit is provided. The circuit includes first and second diode connected transistors. A first switched current source is coupled to the one transistor to inject or remove a first current into or from the emitter of that transistor. The first current is selected to correct for curvature in the output voltage of the bandgap circuit at one of hotter or colder temperatures.09-29-2011
20130154605CONSTANT VOLTAGE CIRCUIT AND ELECTRONIC DEVICE INCLUDING SAME - A constant voltage circuit includes an output control transistor to control an output current from an output terminal to keep an output voltage constant at a set voltage; and an excess-current protection circuit to control the output control transistor. The excess-current protection circuit includes a current increase restriction element to restrict increase in the output current to decrease the output voltage; a first current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a first limited voltage; a second current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a second limited voltage smaller than the first limited voltage; and a selector to select whether the first current limitation circuit is operated or stopped.06-20-2013
20130154604REFERENCE CURRENT GENERATION CIRCUIT AND REFERENCE VOLTAGE GENERATION CIRCUIT - Provided are a reference current generation circuit and a reference voltage generation circuit, which have improved response speed when power supply is activated or fluctuates. In order to reduce a load capacitance of an operational amplifier, a transistor for providing a current to a transistor pair having a common gate-source voltage is provided, and the operational amplifier controls an ON-state resistance of the transistor.06-20-2013
20110279106Threshold voltage generating circuit - A threshold voltage generating circuit includes a main control circuit and a biasing circuit connected with the main control circuit. The main control circuit includes a first switching element, a second switching element connected with the first switching element, a third switching element connected with the second switching element, and a first operational amplifier connected with the third switching element, wherein an output end of the first operational amplifier outputs a threshold voltage. The threshold voltage generating circuit can generate the more precise threshold voltage.11-17-2011
20130187628REFERENCE VOLTAGE GENERATING CIRCUIT - A reference voltage generating circuit with extremely low temperature dependence is provided.07-25-2013
20120019232Current Source with Tunable Voltage-Current Coefficient - A current source providing an output current with a fixed current range includes a bias circuit, a resistor, a current mirror, and a controller. The bias circuit provides a first voltage weighted with a first tunable coefficient and a second voltage weighted with a second tunable coefficient. The resistor has a tunable resistance for determining a bias current according to a voltage difference between the first and the second voltages and the tunable resistance. The current mirror generates the output current according to the bias current. The controller adjusts the tunable resistance and one of the first and the second tunable coefficients to achieve a voltage-current coefficient with different values, while the bias current and the output current are kept within a fixed current range.01-26-2012
20130193949REFERENCE VOLTAGE CIRCUIT AND IMAGE-CAPTURE CIRCUIT - A reference voltage circuit for generating a reference voltage to be referred when a pixel signal is digitally converted, includes ramp voltage generating means for generating a ramp voltage which drops from a predetermined initial voltage at a certain gradient, a transistor for forming, together with the ramp voltage generating means, a current mirror circuit, and gain change means for changing a current value of a current flowing from a predetermined power supply via the transistor to change the gradient of the ramp voltage generated by the ramp voltage generating means.08-01-2013
20130200877GRADATION VOLTAGE GENERATING CIRCUIT AND LIQUID CRYSTAL DISPLAY DEVICE - A gradation voltage generating circuit includes a resistor ladder circuit and a constant current circuit. The resistor ladder circuit has a plurality of resistors. The constant current circuit is electrically connected to the resistor ladder circuit. The constant current circuit is configured to supply a constant current to the resistor ladder circuit such that the resistor ladder circuit produces a plurality of reference potentials that is configured to be directly supplied to a source driver.08-08-2013
20130200878ULTRA-LOW NOISE VOLTAGE REFERENCE CIRCUIT - A voltage reference circuit comprises a plurality of ΔV08-08-2013
20130207634SEMICONDUCTOR DEVICE INCLUDING VOLTAGE GENERATING CIRCUIT - A semiconductor device includes a voltage generating circuit, a first switch, and a charging circuit. The voltage generating circuit generates a voltage for output and has a function to adjust a magnitude of the voltage to be generated. A first switch has a first conduction terminal and a second conduction terminal that are brought into conduction with each other in an ON state, and the first conduction terminal is connected to an output node of the voltage generating circuit via a first line. The charging circuit charges a second line connected to the second conduction terminal of the first switch.08-15-2013
20130207635POWER SUPPLY CIRCUIT - An electronic circuit includes a switchable circuit domain that operates in a RUN mode and a STANDBY mode and receives a supply current from a core power supply. A power regulator is connected between the core power supply and the switchable circuit domain to regulate the supply current provided to the switchable circuit domain when the electronic circuit is in the RUN mode. A capacitor is connected between the power regulator and ground and is charged by a refresh circuit when the electronic circuit is in the STANDBY mode. The refresh circuit maintains a voltage across the capacitor when the electronic circuit is in the standby mode, which reduces the time for the electronic circuit to transition from the STANDBY mode to the RUN mode.08-15-2013
20130207636REFERENCE VOLTAGE GENERATOR - Provided is a reference voltage generator having flat temperature characteristics. The reference voltage generator includes: a depletion mode MOS transistor (08-15-2013

Patent applications in class To derive a voltage reference (e.g., band gap regulator)

Patent applications in all subclasses To derive a voltage reference (e.g., band gap regulator)