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Analog input compared with static reference

Subclass of:

341 - Coded data generation or conversion

341126000 - ANALOG TO OR FROM DIGITAL CONVERSION

341155000 - Analog to digital conversion

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
341159000 Parallel type 41
341161000 Acting sequentially 36
341164000 Single comparator and counter 6
341163000 Recirculating 4
20130069811LOW POWER CYCLE DATA CONVERTER - A redundant signed digit (RSD) analog to digital converter (ADC) receives a high voltage (VRH) and a low voltage (VRL) for use in converting an input signal to a digital signal. A doubling circuit receives the input signal and doubles the input signal to provide a doubled input signal using an amplifier and a first capacitor. The first capacitor has a capacitance of a first magnitude. A VR circuit continues processing the doubled input signal to provide a 03-21-2013
20080309542A/D converter circuit and A/D conversion method - An A/D converter circuit has a first ring delay line and a second ring delay line configured to vary respective characteristics in the same manner relative to a change in the ambient temperature. A reference voltage, which is free from a change in temperature, is fed as a power supply voltage to the second ring delay line. Digital data produced by the first ring delay line is temperature-compensated by digital data produced by the second ring delay line.12-18-2008
20090128390SIGNAL LEVEL CONVERSION CIRCUIT FOR INCREASING DYNAMIC RANGE OF ANALOG-TO-DIGITAL CONVERTER - Disclosed herein is a signal level conversion circuit for increasing the dynamic range of an Analog-to-Digital Converter (ADC). A comparison and calculation unit compares the value of an input signal V05-21-2009
20120007762CURRENT REDUCTION IN A SINGLE STAGE CYCLIC ANALOG TO DIGITAL CONVERTER WITH VARIABLE RESOLUTION - A converter (01-12-2012
341165000 Single comparator and digital storage 3
20100271250Analog to Digital Converter (ADC) with Comparator Function for Analog Signals - This disclosure relates to analog to digital converter (ADC) component with a comparator function for analog signals.10-28-2010
20090102694High Speed Parallel Procesing Digita Path for SAR ADC - The analog-to-digital for converter (ADC) for converting an analog value into a digital equivalent using a parallel digital data path is disclosed. In one example embodiment, the ADC includes a switched capacitor DAC having an input to receive an analog value via analog sample and hold circuit. A comparator is coupled to the switched capacitor DAC. A successive approximation register (SAR) is coupled to the comparator. A plurality of logic blocks is coupled to the SAR. A plurality of thermometric encoders is coupled to the associated plurality of logic blocks. A plurality of MUXs is coupled to the associated plurality of thermometric encoders and the comparator, wherein the plurality of MUXs having associated outputs that is coupled to the input of the switched capacitor DAC.04-23-2009
20130021189Freescale confidential proprietary comparator - A comparator is provided. In one embodiment, a method of operating a comparator comprises providing a bias current (01-24-2013
341162000 Serial conversions with change in signal 3
20100156692MULTI-STAGE DUAL SUCCESSIVE APPROXIMATION REGISTER ANALOG-TO-DIGITAL CONVERTOR AND METHOD OF PERFORMING ANALOG-TO-DIGITAL CONVERSION USING THE SAME - A multi-stage dual successive approximation register analog-to-digital converter (SAR ADC) and a method of performing analog-to-digital conversion using the same are provided. The multi-stage dual SAR ADC includes: a plurality of SAR ADC stages for converting an analog input voltage into a predetermined bit digital signal, each SAR ADC stage being serially connected to one another and including two SAR ADCs; and at least one residue amplifier respectively connected between every two successive SAR ADC stages, amplifying residue voltage output from a previous SAR ADC stage to output the amplified residue voltage to a next SAR ADC stage. The two SAR ADCs of the previous SAR ADC stage share the residue amplifier.06-24-2010
20090085790PIPELINE ANALOG-TO-DIGITAL CONVERTER AND METHOD OF DRIVING THE SAME - A pipeline analog-to-digital converter includes a conversion unit receiving an analog input signal and outputting a plurality of digital signals corresponding to quantization values obtained by quantizing the input signal, the conversion unit including a plurality of stages that output the plurality of digital signals, the plurality of stages being connected in a cascade manner, each of the stages receiving a residue analog signal from a previous stage, and a first stage receiving an analog input signal and a digital correction logic receiving the plurality of digital signals, correcting an error, and outputting a digital output signal corresponding to the input signal, wherein a first reference voltage is applied to the plurality of stages, a second reference voltage, which is different from the first reference voltage, is applied to at least one of the plurality of stages, at least one of the plurality of stages includes a plurality of unit capacitors that sample the residue analog signal, and at least one of the plurality of unit capacitors is coupled to the second reference voltage.04-02-2009
20130021188MULTIPLEXED AMPLIFIER WITH REDUCED GLITCHING - In many applications, which use amplifiers that operate at less than 50% duty cycle, it would be advantageous to reduce the number amplifiers to reduce power consumption. Here, an amplifier is provided which is time multiplexed to accommodate multiple data paths. Additionally, reset circuitry or a reset mechanism is provided at the output terminals of this amplifier to briefly short the output terminals to generally prevent glitching that may result from switching between data paths.01-24-2013
Entries
DocumentTitleDate
20110205099SUCCESSIVE APPROXIMATION TYPE A/D CONVERTER CIRCUIT - A successive approximation type A/D converter circuit includes a comparator circuit which determines which of an input analog voltage and a comparison voltage is larger, a register which successively takes in and stores a comparison result, and a local DA converter circuit which converts a register value into a voltage to generate the comparison voltage. The comparator circuit includes amplifier stages and a feedback capacitor connected to an input terminal of one of the amplifier stages, takes in an analog voltage during a first period, receives a input voltage depending on a potential difference between the analog and comparison voltages and amplifies the input voltage in the amplifier stage during a second period, and applies positive feedback to an input terminal of a corresponding amplifier stage via the feedback capacitor so as to impart a hysteresis of 1 LSB or less when an output of the comparator circuit changes.08-25-2011
20100013692A/D CONVERTER - An external input operation clock signal is required for operating a conventional A/D converter, and the performance of the A/D converter is undesirably determined by the characteristics of the external input operation clock.01-21-2010
20130135132ANALOG-TO-DIGITAL CONVERTER - The present invention provides an analog-to-digital converter, which comprises an integration circuit, a threshold signal generating circuit, a main comparison circuit, a sub comparison circuit, a counter, and a decoder. The integration circuit integrates an input signal and produces an integration signal. The threshold signal generating circuit generates a main threshold signal and a plurality of sub threshold signals. The main comparison circuit produces a plurality of main comparison signals according the integration signal and the main threshold signal. The sub comparison circuit produces a plurality of sub comparison signals according to the integration signal and the plurality of sub threshold signals. The counter counts the plurality of main comparison signals and produces a first counting signal. The decoder decodes the plurality of sub comparison signals and produces a second count signal. The first count signal and the second count signal are used for producing a digital signal.05-30-2013
20130076550ANALOG-TO-DIGITAL CONVERTER - According to an embodiment, an analog-to-digital converter includes a voltage generating unit, and a plurality of comparators. The voltage generating unit is configured to divide a reference voltage by a plurality of variable resistors to generate a plurality of comparative voltages. Each of the plurality of comparator is configured to compare any one of the plurality of comparative voltages with an analog input voltage and output a digital signal based on a result of a comparison between the comparative voltage and the analog input voltage. Each of the plurality of variable resistors includes a plurality of variable resistive elements that are connected in series, and each of the plurality of variable resistive elements has a resistance value that is variably set according to an external signal.03-28-2013
20100045504VOLTAGE ERROR CORRECTION SYSTEM - A voltage error correction system includes a voltage converter, a first and a second analog to digital converters, a subtracter, an adder, and a digital voltage generator. The voltage converter adjusts an input voltage proportionally, adds the adjusted input voltage to a reference voltage to obtain a positive voltage, and outputs the positive voltage. The first analog to digital converter converts the positive voltage into a first digital voltage, the second analog to digital converter converts the reference voltage into a second digital voltage, the subtracter subtracts the second digital voltage from the first digital voltage and outputs a difference voltage, and the adder outputs a corrected voltage by adding the difference voltage of the subtracter to a compensation voltage.02-25-2010
20090027251SAR ANALOG-TO-DIGITAL CONVERTER WITH LARGE INPUT RANGE - A method for analog-to-digital conversion is provided using successive approximation and a plurality of capacitors comprising a first set of capacitors and a second set of capacitors, a first side of each of the plurality of capacitors being coupled to a common node. The method comprises sampling an input voltage on the first set of capacitors, after the step of sampling leaving a side of at least one capacitor of the first set of capacitors floating, coupling a capacitor of the first set of capacitors, which is not floating, with a capacitor of the second set of capacitors so as to redistribute the charge on the coupled capacitors, comparing the voltage on the common node with a comparator reference voltage level to receive a comparison result to be used for a bit decision, and switching the floating side of the floating capacitor of the first set of capacitors to either a first reference voltage or a second reference voltage in accordance with the bit decision.01-29-2009
20120306680CURRENT PROVIDING SYSTEM, ADC WITH THE CURRENT PROVIDING SYSTEM, AND CURRENT PROVIDING METHOD - A current providing system, for providing an output current, which comprises: a frequency detecting circuit, for receiving at least one input signal, and for detecting a frequency of the input signal; a frequency-controlled current providing circuit, for providing the output current according to the input signal frequency when the input signal frequency is in a first predetermined range; and a predetermined current providing circuit, for providing the output current with a first predetermined current value, when the input signal frequency is not in the first predetermined range.12-06-2012
20120235846APPARATUSES AND METHODS FOR REDUCING ERRORS IN ANALOG TO DIGITAL CONVERTERS - Successive approximation Analog-to-digital converters (ADCs) and related methods are disclosed. A successive approximation ADC includes a comparator with a comparator output and inputs coupled to a common model signal and a compare input. Control logic generates one or more control signals responsive to the comparator output. A capacitor array includes first sides of capacitors operably coupled to an array output. The capacitor arrays selectively couples each of second sides of the capacitors to an analog input signal and one or more input reference signals responsive to the one or more control signals. A voltage limiter is operably coupled between the array output and the compare input of the comparator and limits a voltage on the compare input to within a predefined range relative to the array output. The successive approximation ADC may also be configured differentially with a second comparator and a second voltage limiter.09-20-2012
20110285568ASYNCHRONOUS DIGITAL SLOPE ANALOG-TO-DIGITAL CONVERTER AND METHOD THEREOF - The present invention is related to an analog to digital converter circuit. The circuit comprises at least one input node for applying an analog input voltage signal (V11-24-2011
20120154194SUCCESSIVE APPROXIMATION ANALOG-TO-DIGITAL CONVERTER HAVING AUXILIARY PREDICTION CIRCUIT AND METHOD THEREOF - The configurations and adjusting method of a successive approximation analog-to-digital converter (SAR ADC) are provided. The provided SAR ADC includes at least one capacitor with a first and a second terminals, and a plurality of bits, each of which is connected to the at least one capacitor, wherein the first terminal receives an input signal, and the second terminal selectively receives one of a first and a second reference voltages, and a first comparator receiving an adjustable third reference voltage and a first voltage value generated by the input signal, wherein a connection of the second terminal of each the capacitor of the capacitor array is switched when the first voltage value is larger than the third reference voltage.06-21-2012
20110291873DIFFERENTIAL AMPLIFIER AND PIPELINE A/D CONVERTER USING THE SAME - In a differential amplifier, input terminals to which a differential input is given are connected to gates of input transistors, respectively. One ends of capacitive devices are connected to sources of the input transistors, respectively. A switching section switches connection between the other ends of the capacitive devices and the input terminals according to a control clock at each phase.12-01-2011
20080266161ANALOG-TO-DIGITAL CONVERTER, RECEIVER ARRANGEMENT, FILTER ARRANGEMENT AND SIGNAL PROCESSING METHOD - A filter arrangement comprises a switching element coupled to a filter input, wherein the switching element is controllable by a reference clock signal. The filter arrangement further comprises an input storage element, an output storage element, and a first and a second auxiliary storage element. The first and the second auxiliary storage element can each be connected in parallel to the input storage element or to the output storage element depending on a switching signal. The output storage element is coupled to a filter output. The filter arrangement can be used as a loop filter in an analog-to-digital converter, wherein the output signal of the filter arrangement is quantized to provide an output word. Respective feedback signals can be generated from the output word and be provided to the storage elements.10-30-2008
20090273501SUCCESSIVE APPROXIMATION REGISTER ANALOG TO DIGITAL CONVERTER WITH IMPROVED IMMUNITY TO TIME VARYING NOISE - An SAR ADC provides increased immunity to noise introduced by time varying noise components provided on reference potentials (V11-05-2009
20100066581SAMPLE/HOLD CIRCUIT, AND ANALOG-TO-DIGITAL CONVERTER - There is disclosed a sample-and-hold circuit. An operational amplifier includes an inverting input terminal, a non-inverting input terminal, an inverting output terminal, and a non-inverting output terminal. First and second groups of capacitors are operated in first to third modes periodically. Positive and negative input signals are input to charge an electric charge in the first mode, electric charge are held while positive and negative output signals are output from the operational amplifier by connecting between the inverting input terminal and the non-inverting output terminal and by connecting between the non-inverting input terminal and the inverting output terminal in the second mode, and electric charge are discharged in the third mode. Second group of capacitors shifts to the third mode when first group of capacitors is in the first or second mode, and shift to the first or second mode when first group of capacitors is in the third mode.03-18-2010
20100079327DATA CONVERSION CIRCUITRY AND METHOD THEREFOR - A data converter for converting analog signals to digital signals, or for converting digital signals to analog signals is provided. In one embodiment, a production self-test is provided. In one embodiment, a high-speed lower-resolution method or mode for a data converter is provided. In one embodiment, a differential data converter with a more stable comparator common mode voltage is provided. In one embodiment, the input range of a digitally calibrated data converter is provided and maintained so that there is no loss in input range due to the calibration. In one embodiment, digital post-processing of an uncalibrated result using a previously stored calibration value is provided.04-01-2010
20110169681COMPARATOR AND ANALOG-TO-DIGITAL CONVERTER - Increase of power consumption is reduced, and the operational speed is improved. A comparator includes a comparing section which outputs a result of comparison between a first voltage and a second voltage which constitute an input differential signal, a first positive feedback section which operates in synchronism with a first clock signal, amplifies the result from the comparing section, and outputs the amplified result to an output node pair, and a second positive feedback section which operates in synchronism with a second clock signal, and provides positive feedback to the output node pair.07-14-2011
20090002214Filter With Forward Coupling - This disclosure relates to techniques and architecture for summing, sampling, and converting signals associated with a capacitive feedforward filter using a quantizer.01-01-2009
20080272951SELF-ADAPTING TRACKING ANALOGUE-TO-DIGITAL CONVERTER AND RF TRANSMITTER - A self-adapting analogue-to-digital converter includes a forward path with a voltage divider coupled to a digital integrator. In a feedback path, a scaler is connected to a digital-to-analogue converter. A control unit provides control signals for the voltage divider and the scaler in response to the output word of the digital integrator.11-06-2008
20080291072ANALOG-DIGITAL CONVERTER AND IMAGE SENSOR - An analog-digital converter performs AD conversion of an upper m bits by sequential comparison, and performs AD conversion of a lower n bits by integration. This increases accuracy, reduces power consumption during operation, reduces variation between analog signals and digital signals, and reduces the required layout area by decreasing the number of capacitor elements needed. Also, the AD conversion of the n bits by integration is performed by ramp voltage quantized with a margin of k bits of the lower n bits. As such, preferable AD conversion characteristics can be obtained when offset or the like is produced in a DA conversion circuit for generating ramp voltage.11-27-2008
20100127910COMPARATOR AND PIPELINED ADC UTLIZING THE SAME - A comparator includes a plurality of switches, a capacitor, an amplifier, and a latch. The switches provide an input signal during a first period and provide a reference signal during a second period. A first switch among the switches is composed of a first transistor. The capacitor receives the input signal during the first period and receives the reference signal during the second period. The amplifier is coupled to the capacitor for receiving a difference voltage between the input signal and the reference signal and amplifies the difference voltage during the second period to generate an amplified result. The determining circuit provides a digital signal according to the amplified result.05-27-2010
20080284635TRANSDUCER DEVICE - A transducer device for converting an analog DC voltage signal into a digital signal is provided, with an oscillator device for outputting a first oscillator signal and a second oscillator signal, whereby the oscillator device is formed to generate the first oscillator signal and the second oscillator signal phase-locked to one another and with the substantially same frequency from a reference signal, with an analog frequency converter connected to the oscillator device for transforming the analog DC voltage signal by the first oscillator signal in a first spectral range with a first center frequency to obtain a transformed signal, with an analog-to-digital converter for converting the transformed signal into a transformed digital signal; and with a digital frequency converter connected to the oscillator device for transforming the transformed digital signal by means of the second oscillator signal in a second spectral range with a second center frequency to obtain the digital signal.11-20-2008
20100321227Current Mode Analog-to-Digital Converter - A current-mode analog-to-digital converter includes: a current input node; a current-mode sample and hold circuit configured to output a steady source of electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node; and at least one current comparator that compares the electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node.12-23-2010
20080316080Successive approximation type A/D converter - A successive approximation type A/D converter includes a main capacitance array connected with a common connection node; a correction capacitance array; a voltage comparator configured to detect a voltage of the common connection node; and a successive approximation register in which a value is set based on an output of the voltage comparator. A first control circuit changes voltages applied to capacitance elements of the main capacitance array and the correction capacitance array based on a value set in the successive approximation register. A second control circuit responds to a control signal to connect the main capacitance array to an input voltage signal or a first predetermined voltage, and the correction capacitance array to the common connection node or a second predetermined voltage.12-25-2008
20090096655ANALOG TO DIGITAL CONVERTER WHICH USES TUNNELING MAGNETO-RESISTIVE DEVICES - An A/D converter is provided. The A/D converter determines a digital output value according to the resistance of the TMR device, resistance of which changes according to the magnetic field generated by at least one electrode into which current flows according to an analog input signal. Accordingly, an A/D converter to implement high resolution and high speed with low power consumption can be provided.04-16-2009
20090102693Serial-parallel type analog-to-digital converter and analog-to-digital conversion method - A serial-parallel type analog-to-digital converter includes a reference voltage generator, a higher bit comparing portion and a lower bit comparing portion, and a reference voltage selecting portion, wherein the lower bit comparing portion includes the plurality of comparison stages.04-23-2009
20100188277SUCCESSIVE APPROXIMATION A/D CONVERTER - A successive approximation A/D conversion circuit for simultaneously sampling N channels of analog signals and for A/D converting the sampled analog signals, includes: N capacitive main DACs; a resistive sub DAC; N comparators; and a successive approximation control circuit, wherein the successive approximation control circuit determines high-order bit values of A/D conversion results of the N channels of analog signals by controlling the N capacitive main DACs and the N comparators, and determines low-order bit values of the A/D conversion results of the N channels of analog signals by controlling the resistive sub DAC and the N comparators.07-29-2010
20100182184ANALOG-TO-DIGITAL CONVERTER AND ELECTRONIC SYSTEM INCLUDING THE SAME - An analog-to-digital converter includes a first logic unit and a second logic unit. The first logic unit is configured to receive a plurality of thermometer codes and inverse thermometer codes generated based on an analog signal received by the analog-to-digital converter and to generate a plurality of first digital codes that periodically repeat the same pattern based on a transition position of a logic value in each of the thermometer codes and the inverse thermometer codes. The second logic unit is configured to receive the plurality of first digital codes and to generate a plurality of second digital codes based on logic values of a plurality of bits among all bits of each of the first digital codes.07-22-2010
20090045995COMPARATOR AND ANALOG-TO-DIGITAL CONVERTER USING THE SAME - A comparator includes a first inverter which is inserted between a power source terminal and one end of a first variable resistor, includes a first FinFET provided with a first gate terminal for receiving a positive phase output signal, and a second gate terminal for receiving a clock signal changing between a first level and a second level, inverts the positive phase output signal, and outputs a negative phase output signal, and a second inverter which is inserted between the power source terminal and one end of a second variable resistor, includes a second FinFET provided with a third gate terminal for receiving the negative phase output signal, a fourth gate terminal for receiving the clock signal, and the same polarity as the first FinFET, inverts the negative phase output signal, and outputs the positive phase output signal.02-19-2009
20130135133Integration and Analog to Digital Conversion Circuit With Common Capacitors and Operating Method Thereof - The present invention provides an integration and analog to digital conversion circuit sharing common capacitors. The circuit comprises a capacitor array module, an integration circuit, and an analog to digital conversion (ADC) logic. The capacitor array module has a plurality of capacitors. The integration circuit is configured to integrate an analog signal by the capacitor array module. The ADC logic is configured to convert the output of the capacitor array module to a digital signal.05-30-2013
20130135134Integration and Analog to Digital Conversion Circuit With Common Capacitors and Operating Method Thereof - The present invention provides an integration and analog to digital conversion circuit sharing common capacitors. The circuit comprises a first capacitor array module, a second capacitor module, an integration circuit, an analog to digital conversion (ADC) logic. The first capacitor array module has a plurality of capacitors. The second capacitor array module has a plurality of capacitors. The integration circuit is configured to integrate an analog signal by said first or said second capacitor array module. The ADC logic is configured to convert the output of said first or said second capacitor array module to a digital signal. The ADC logic performs conversion by said first capacitor array module while said integration circuit performs integration by said second capacitor array module, and said ADC logic performs conversion by said second capacitor array module while said integration circuit performs integration by said first capacitor array module.05-30-2013
20090066555A/D Converter Comprising a Voltage Comparator Device - The present invention discloses an analogue-to-digital converter comprising at least two voltage comparator devices. Each of the voltage comparator devices comprises a differential structure of transistors and is arranged for being fed with a same input signal and for generating an own internal voltage reference by means of an imbalance in the differential structure, said two internal voltage references being different. Each voltage comparator is arranged for generating an output signal indicative of a bit position of a digital approximation of the input signal.03-12-2009
20090073019A/D Convertion controlling device and image forming apparatus - A reference voltage generating unit generates a plurality of analog reference voltages, and an A/D converting unit converts the analog reference voltages thus generated and an analog input voltage input from an external device to digital reference values. A CPU generates, based on the analog reference voltages and the digital reference values converted from the analog reference voltages, an equation for correcting the analog input voltage to be converted to a digital value falling in a range of the digital reference values. With the equation generated, the CPU calculates the analog input voltage for the digital value obtained by conversion.03-19-2009
20110128177Apparatus and Methods Thereof for Reducing Energy Consumption for PWM Controlled Integrated Circuits in Vehicles - An apparatus, protocol and methods for reducing vehicle energy consumption and for precise electronic event control, by implementing full CPU off-loading, using pulse-width modulation (PWM) with analog feedback diagnosis enabling real-time operation. Accordingly, analog feedback is used for external integrated circuits (IC) controlled by a PWM output, for processes to be analyzed. The apparatus includes a microprocessor that integrates an autonomous PWM module and an analog-to-digital converter (ADC) group manager, each including register modules for enabling analog-to-digital signal conversion comparisons of PWM feedback data, and generating of an interrupt commands when required.06-02-2011
20090322579APPARATUS AND METHOD FOR A/D CONVERSION - An A/D conversion apparatus includes an A/D conversion circuit and a reference voltage generating circuit which includes a first switch circuit configured to switch between a state in which the inputs of an operational amplifier are swapped and a state in which these inputs are not swapped, and a second switch circuit configured to switch between a state in which the output voltage of the operational amplifier is output as having a normal phase and a state in which the output voltage is output as having a reversed phase. The A/D conversion circuit obtains a first digital value by setting the first and second switch circuits to a first state, and obtains a second digital value by setting the first and second switch circuits to a second state different from the first state, followed by producing a result of A/D conversion computed from the first and second digital values.12-31-2009
20100123612ANALOG-TO-DIGITAL CONVERSION CIRCUIT AND DEVICE - An analog-to-digital conversion circuit and device having an input stage arranged to receive an input signal and to provide an output analog signal as a function of the input signal; an analog-to-digital conversion block arranged to receive the output analog signal and to provide a respective output digital signal. The input stage includes a first voltage buffer arranged to provide the output analog signal to the conversion block as the translation of the input signal of an amount equal to a translation voltage; a second voltage buffer arranged to provide a first reference signal to the conversion block that is representative of the translation of a first reference voltage of an amount equal to the translation voltage, so that the conversion block stores the input signal as the difference of the input signal and the first reference voltage regardless of the translation voltage.05-20-2010
20110148683ANALOG-TO-DIGITAL CONVERTER - There is provided an analog-to-digital converter that comprises an analog signal input for receiving an analog signal; a reference voltage input for receiving a reference voltage signal; and a plurality of comparators, one input of each comparator being connected to the analog signal input, and the other input of each comparator being connected so as to receive a respective portion of the reference voltage signal; wherein at least one of the plurality of comparators can be selectively activated and deactivated in order to determine a mode of operation of the analog-to-digital converter.06-23-2011
20080204300AD CONVERTER CIRCUIT AND MICROCONTROLLER - A successive approximation type AD converter circuit for comparing an analog input signal with an output analog signal of a DA converter with a comparator to input a digital signal output in accordance with a comparison result to the DA converter to determine a digital signal obtained if the output analog signal of the DA converter is equal to the analog input signal, as an AD-converted output signal, includes: an AD converter for AD-converting the analog input circuit in accordance with a sampling period for sampling the analog input signal and a comparison period for comparing the sampled analog input signal with the output analog signal of the DA converter with the comparator; and setting means for independently setting a cycle time of a first clock signal for determining the sampling period and a cycle time of a second clock signal for determining the comparison period.08-28-2008
20080204299ADC WITH LOGARITHMIC RESPONSE AND METHODS FOR CONTROLLING RF POWER LEVELS - Embodiments of an analog-to-digital converter (ADC) and methods for controlling RF power levels are generally described herein. Other embodiments may be described and claimed. In some embodiments, the ADC includes an internal-reference digital-to-analog converter (DAC) having a resistive structure with linearly-spaced contact nodes. The linearly-spaced contact nodes may provide corresponding reference voltages that vary exponentially with respect to the linearly-spaced contact nodes allowing the ADC to achieve a logarithmic response.08-28-2008
20100214147ANALOG-DIGITAL CONVERTER - An analog-digital converter according to the present invention includes an input polarity switching unit, an integrator that integrates an input signal, an integrator output adjusting circuit that adjusts an output voltage of the integrator, a window comparator, and a controller that controls the input polarity switching unit, the integrator output adjusting circuit, and the window comparator, and generates a digital signal. When the output voltage of the integrator reaches a first reference voltage, the controller resets reference voltage of a high-voltage side comparator to a second reference voltage. Further, when the output voltage of the integrator reaches a third reference voltage, the controller resets reference voltage of a low-voltage side comparator to a fourth reference voltage. According to the analog-digital converter of the present invention, it is possible to prevent device breakdown and occurrence of through current due to fluctuation of the output voltage of the integrator.08-26-2010
20100066582CURRENT MODE DOUBLE-INTEGRATION CONVERSION APPARATUS - A double-integration signal processing apparatus for pulse width amplification and A/D conversion is provided. The current mode double-integration conversion apparatus includes: a current mode double-integration unit which integrates an input current in a predetermined time interval and outputs an integration voltage; a comparison unit which compares the integration voltage output from the current mode double-integration unit with a predetermined comparison voltage V k and outputs an comparison pulse signal; and a gate logic unit which performs a logic operation by using the comparison pulse signal of the comparison unit and an internal signal and outputs an logic operation pulse signal. Accordingly, the current mode double-integration conversion apparatus can be applied to various sensors.03-18-2010
20120098691QUANTIZING CIRCUITS WITH VARIABLE PARAMETERS - Systems, methods, and devices for obtaining data from a data location. The method may include generating a first value by sensing a data location under a first condition and generating a second value by sensing the data location under a second condition. The method may further include combining the first value with the second value to identify data conveyed by the data location.04-26-2012
20120026026ANALOG-TO-DIGITAL CONVERTER HAVING A SINGLE SET OF COMPARATORS FOR A MULTI-STAGE SAMPLING CIRCUIT AND METHOD THEREFOR - An analog to digital converter includes a first sample circuit that samples an analog input during a first phase of a clock. A second sample circuit samples the analog input during a second phase of the clock. A comparator compares a reference to the output of the first sample circuit during a non-overlapping time between an end of the first phase and beginning of the second phase and compares the reference to the output of the second sample circuit during a non-overlapping time between an end of the second phase and beginning of the first phase. The first sample circuit couples the sample of the analog input taken by the first sample circuit to the input of the comparator during the non-overlapping time between the end of the first phase and the beginning of the second phase and the second sample circuit couples the sample of the analog input taken by the second sample circuit to the input of the comparator during the non-overlapping time between the end of the second phase and the beginning of the first phase.02-02-2012
20100007540BINARY CONTROLLER AND POWER SUPPLY WITH A BINARY CONTROLLER - A controller is described, which is particularly suited for a power supply with switching elements (S01-14-2010
20100007541A/D CONVERTER - The conventional A/D converter has a drawback that the conversion precision is degraded when the operation periods of the constituents of the A/D converter are shortened due to the duty ratio of an external input clock because the operation periods of the constituents of the A/D converter depend on the pulse width of the external input clock. However, a highly-precise A/D conversion operation independent of the duty ratio of the external input clock can be realized by providing a circuit for detecting the operation periods of the constituents of the A/D converter, and adjusting the duty ratio of the operation clock according to the detected operation periods of the constituents of the A/D converter.01-14-2010
20120182170Pipelined Recycling ADC with Shared Operational Amplifier Function - A pipelined recycling analog-to-digital converter (ADC), which converts a first analog input signal into a first digital output signal, including a first conversion stage and a second conversion stage is disclosed. The first conversion stage includes a first processing unit and a second processing unit. The first and the second processing units execute a number of conversion operations. For each conversion operation, an analog value and a digital code are generated by the first or the second processing unit. The first and the second processing units share an operational amplifier, and for each conversion operation. The second conversion stage includes a comparing unit which determines a specific analog value among the analog values generated by the first and the second processing units. When the specific analog value is not located within a predetermined range, the comparing unit generates a reset pulse to reset the operational amplifier.07-19-2012
20120319886HIGH SPEED RESISTOR-DAC FOR SAR DAC - A singled-ended, successive approximation register analog-to-digital converter convert an analog input voltage to a digital representation comprising m upper order bits and a number of lower order bits. The SAR ADC comprises SAR logic, a resistive network, multiple switches, and first and second LSB capacitors. The switches also comprises two sets of switches coupled to the resistive network, each set of switches is configured to couple a selected tap to each of the first and second LSB capacitors. When determining the lower order bits, the SAR logic is configured to control the sets of switches to change the first and second taps from one cycle in which one of the lower order bits is determined to a next cycle in which the next of the lower order bits is determined so that the voltage of both taps changes by a decreasing amount with each succeeding bit being determined.12-20-2012
20120268301 Calibration Scheme for Resolution Scaling, Power Scaling, Variable Input Swing and Comparator Offset Cancellation for Flash ADCs - In one embodiment, a comparator of a Flash analog-to-digital converter (ADC) is calibrated in the background by switching the comparator to a feedback loop, determining the comparator's current reference level, and adjusting the comparator's reference level to a target reference level by charging a reference capacitor coupled the comparator.10-25-2012
20080252508DATA READOUT SYSTEM HAVING NON-UNIFORM ADC RESOLUTION AND METHOD THEREOF - A data readout system with non-uniform resolution has a pick up head for reading data stored in an optical disc and generating an analog signal, a reference voltage unit for producing a plurality of reference voltage levels, wherein voltage differences between two adjacent reference voltage levels are not all the same, a plurality of comparators for comparing the reference voltage levels with the analog signal and generating comparison results, and an encoder for encoding the comparison results into a digital signal.10-16-2008
20080224914Integrated Circuit for Analog-to-Digital Conversion - An integrated circuit for analog-to-digital conversion for performing digital conversion of the amount of current of an input current and outputting a digital signal, comprises: a resistor connection terminal to be connected to a resistor; a conversion section configured to convert the amount of current of the input current or the amount of current of a reference current flowing through the resistor into a digital signal to be output; and a compensation section configured to compensate the digital signal corresponding to the input current based on the digital signal corresponding to the reference current.09-18-2008
20110234440AMPLIFYING CIRCUIT AND ANALOG-DIGITAL CONVERTING CIRCUIT INCLUDING SAME - An amplifying circuit includes a pair of MOS transistors; an amplifier that amplify a difference between potentials of differential output nodes coupled to drains of the pair of MOS transistors; cancel circuits that cause cancel current to flow to one of the differential output nodes when the amplifier amplifies a voltage between the differential output nodes and that shut off, after the amplifier performs the amplification operation, inflow of the cancel current; and a controller that performs setting so that a potential of first one of the differential input signals is equal to a potential of another one of the differential input signals, that compares, before the inflow of the cancel current, potentials generated at differential output nodes when the difference between potentials of the differential output nodes is amplified, and that sets the cancel current so that the potentials are reversed after the inflow of the cancel current.09-29-2011
20130154865Method and System for Minimizing Variation of Converter Voltage Reference - A system for minimizing variation of a voltage reference includes a voltage reference generator and a power converter. The voltage reference generator is configured to generate a voltage reference from a supply voltage. The power converter, such as a flyback converter, is configured to supply an adjustable supply voltage to the voltage reference generator. The voltage reference generator generates the voltage reference from the adjustable supply voltage.06-20-2013
20130154866Method and System for Monitoring for Variation of Converter Voltage Reference - A method and system include a converter such as an analog-to-digital converter (“ADC”) and a controller. The converter is configured to receive a sensor signal, indicative of a physical measured quantity, and generate an output signal based on the sensor signal and the voltage reference. The converter is further configured to alternately receive a calibration voltage in lieu of the sensor signal and generate the output signal based on the calibration voltage and the voltage reference. The controller is configured to compare the output signal based on the calibration voltage and the voltage reference with an expected value of the output signal based on the calibration voltage and an assumed value of the voltage reference to detect variation of the voltage reference, and to compensate the output signal based on the sensor signal and the voltage reference as a function of the detected variation of the voltage reference.06-20-2013
20110309963SUCCESSIVE APPROXIMATION TYPE A/D CONVERTER, METHOD OF CONTROLLING SUCCESSIVE APPROXIMATION TYPE A/D CONVERTER, SOLID-STATE IMAGING DEVICE, AND IMAGING APPARATUS - A successive approximation type A/D converter includes: a reference signal generating section generating a reference signal; a comparator comparing an analog signal input thereto with the reference signal and converting the analog signal into a digital signal; and a control section controlling the reference signal to perform oversampling by executing an A/D conversion process on the analog signal at the comparator plural times such that the analog signal is A/D-converted into a digital value of N bits at the first A/D conversion process and such that the second and subsequent A/D conversion processes are performed starting with a lower bit of the (N−n)-th or lower order with upper n bits of the N-bit digital value obtained at the first A/D conversion process fixed.12-22-2011

Patent applications in class Analog input compared with static reference

Patent applications in all subclasses Analog input compared with static reference