Patent application number | Description | Published |
20080204298 | AD CONVERTER AND RADIO RECEIVER - Disclosed is an AD converter including: a first conversion stage including a quantizing part to generate m parallel pieces of quantized signals from m pieces of input analog signals representing n-dimensional vectors (n≦m≦2n), a decoding part to generate m pieces of decoded analog signals from the m parallel pieces of quantized signals, and a residual amplifying part to output m pieces of amplified residual signals by multiplying respective differences between each of the m pieces of analog signals and each of the m pieces of decoded analog signals; a second conversion stage including a quantizing part to generate m parallel pieces of quantized signals from the m pieces of amplified residual signals; and a synthesizing part to generate m parallel pieces of digital signals by synthesizing each of the quantized signals in the first conversion stage and in the second conversion stage at each parallel position. | 08-28-2008 |
20080291070 | DIGITAL/ANALOG CONVERTER AND TRANSMITTER - According to an embodiment of the invention, there is provided a digital/analog converter includes: a decoder that converts a (n−1)-phase input digital signal to a n-phase output digital signal; and a signal generating unit that generates analog signals according to the n-phase output digital signal. | 11-27-2008 |
20080315246 | TRANSISTOR SWITCH CIRCUIT AND SAMPLE-AND-HOLD CIRCUIT - A transistor switch circuit includes: a MOS transistor in which a channel is formed when a gate-source voltage is zero; and a voltage supply part which is connected to a gate of the MOS transistor to supply the gate with a voltage for turning off the MOS transistor. | 12-25-2008 |
20090045995 | COMPARATOR 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 |
20090079598 | SAMPLE RATE CONVERTER - The sample rate converter includes a synthesizing unit which synthesizes an input signal sampled with frequency fs with a feedback signal of the frequency fs, in a frequency band from 0 to fs/N (where N indicates a natural number), with a gain greater than at least 1, to generate a synthesized signal, a downsampler which downsamples the synthesized signal to obtain an output signal of sample rate fs/N, and an upsampler which upsamples the output signal to generate the feedback signal. | 03-26-2009 |
20090245429 | SAMPLE RATE CONVERTER AND RECEIVER USING THE SAME - A sample rate converter includes a multiplexer which multiplexes input signals, an interpolator which interpolates a multiplexed output signal to generate a first feedback signal, a multiplier which multiplies the first feedback signal by a coefficient, a subtracter which subtracts the multiplied signal from the multiplexed input signal, an adder which adds the residual signal and a second feedback signal to sequentially generate integrated signals corresponding to the input signals, respectively, a register circuit configured to individually hold integrated signals, a multiplexer which multiplexes the integrated signals from the register circuit to generate the second feedback signal, a multiplexer which multiplexes the integrated signals from the register circuit to generate a decimation target signal, a decimator which subjects the decimation target signal to decimation to generate the multiplexed output signal, and a discrimination circuit configured to discriminate the multiplexed output signal to generate output signals. | 10-01-2009 |
20090245437 | SAMPLE RATE CONVERTER AND RCEIVER USING THE SAME - A sample rate converter includes a multiplexer to select either one of an input signal and a first feedback signal, and to obtain a selected input signal, a decimator performing decimation on an Nth-order integration signal to generate an output signal, an interpolator performing interpolation on the output signal to generate a second feedback signal, a multiplier which multiplies the second feedback signal by a coefficient to generate a multiplication signal, a subtractor which subtracts the multiplication signal from the selected input signal to generate a residual signal, an adder which adds the residual signal to a third feedback signal to sequentially generate 1st-order to Nth-order integration signals, a register circuit configured to hold the integration signals, a multiplexer to select the first feedback signal from the integration signals that the register hold, and a multiplexer to select the third feedback signal from the integration signals that the register hold. | 10-01-2009 |
20090296858 | DEM SYSTEM, DELTA-SIGMA A/D CONVERTER, AND RECEIVER - A DEM (dynamic element matching) system in which a digital signal is inputted, has a switching circuit which, being equipped with a plurality of switches, each of the plurality of switches is subjected to on/off control based on a switch control signal, receives a first thermometer code in which the total number of logic ones and logic zeros corresponding to the digital signal is “n” and outputs a second thermometer code in which the total number of logic ones and logic zeros is “n” (where “n” is an integer equal to or larger than 2), a latch circuit which latches the second thermometer code output from the switching circuit and outputs the second thermometer code, and a switch control signal generating circuit which generates the switch control signal using the digital signal or the second thermometer code output from the latch circuit and outputs the switch control signal. | 12-03-2009 |
20120133346 | SUCCESSIVE APPROXIMATION REGISTER A/D CONVERTER AND DC/DC CONVERTER - The SAR control circuit of the successive approximation register A/D converter changes the digital value by the first conversion frequency in a first conversion range according to the comparison result signal, and outputs the digital value. | 05-31-2012 |
20120235509 | WIRELESS POWER TRANSMISSION DEVICE - In one embodiment, a power reception device includes a load circuit, to which a first signal having a first power value is supplied from a first resonance circuit connected to a power reception coil, and a first transceiver which transmits the first power value to a power transmission device. The power transmission device includes a second resonance circuit including a plurality of inductors and capacitors to which a second signal having a second power value is input, a power transmission coil connected to the second resonance circuit, a second transceiver which receives the first power value from the first transceiver, and a first control circuit which calculates power transmission efficiency using the first power value and the second power value and adjusts at least one of inductance values of the inductors and/or at least one of capacitance values of the capacitors based on the power transmission efficiency. | 09-20-2012 |
20120242300 | DC-DC CONVERTER CONTROL APPARATUS AND DC-DC CONVERTER - A DC-DC converter control apparatus controls a DC-DC converter which has an inductor connected between an input terminal for a direct-current input voltage and an output terminal for a direct-current output voltage obtained by converting the direct-current input voltage, a capacitor connected to the inductor, and a switch configured to switch whether the direct-current input voltage is applied to the inductor. The DC-DC converter control apparatus has a subtractor configured to generate a differential voltage between the direct-current input voltage and a reference voltage, a comparator configured to generate a determining signal that indicates determination of a polarity of the differential voltage, and a delay part configured to delay the determining signal for a specific delay time. | 09-27-2012 |
20120242310 | DC-DC CONVERTER - The high-side switch has one end connected to the input terminal. The low-side switch has one end connected to other end of the high-side switch and other end connected to a ground terminal. The inductor has one end connected to the other end of the high-side switch and other end connected to the output terminal. The capacitor has one end connected to the other end of the inductor and other end connected to the ground terminal. The high-side switch controlling circuit generates and supplies a high-side switch controlling signal based on a target voltage of the output terminal, the output voltage of the output terminal, and a current flowing through the capacitor, to the high-side switch. The low-side switch controlling circuit generates and supplies a low-side switch controlling signal based on the high-side switch controlling signal and a current flowing through the inductor, to the low-side switch. | 09-27-2012 |
20130002034 | WIRELESS POWER TRANSMITTER - According to one embodiment, a wireless power transmitter wirelessly transmits power to a power receiving apparatus which includes a first resonance circuit and a load circuit. The first resonance circuit includes a power receiving coil and a first capacitor. The wireless power transmitter comprises a second resonance circuit that includes a power transmission coil and a second capacitor and transmits the signal generated by a power supply to the power receiving apparatus, a measuring unit that measures a signal reflection coefficient, and a controller. The controller detects a value of an oscillation frequency of the power supply making the signal reflection coefficient smaller than or equal to a threshold value, calculates an electromagnetic coupling coefficient between the power transmission coil and the power receiving coil, and controls one of the oscillation frequency and a capacitance value of the second capacitor based on the electromagnetic coupling coefficient. | 01-03-2013 |
20130049712 | DC-DC CONVERTER AND INFORMATION PROCESSING DEVICE - There is provided a DC-DC converter which converts an input voltage into an output voltage for supply to a load, in which an input terminal receives the input voltage, an output terminal outputs the output voltage, power stages each includes: a high side switch, a low side switch and an inductor, the control unit executes a first mode and a second mode wherein the first mode controls the high side switch and the low side switch in each of the power stages so that a ratio of an output current in each of the power stages to a load current flowing through the load becomes a set value and the second mode controls the high side switch and the low side switch in each of the power stages so that duty ratios of the high side switch and the low side switch are equalized among the power stages. | 02-28-2013 |
20130214751 | MULTIPHASE SWITCHING POWER SUPPLY CIRCUIT - There is provided a multiphase switching power supply circuit in which an input terminal receives an input voltage, an output terminal outputs an output voltage, first to an Nth power stages each include an inductor having one end connected to the output terminal; a high-side switch that connects another end of the inductor to the input terminal; and a low-side switch that connects the other end of the inductor to a reference voltage, a switch signal controller supplies first to an Nth control signals to the first to Nth power stages, the first to Nth control signals complementarily turning on and off their corresponding high-side switches and low-side switches at a frequency fs, and a switch signal controller determines phases of the first to Nth control signals according to a ration between inductance values of the inductors included in the first to Nth power stages. | 08-22-2013 |
20130214953 | DA CONVERTER - There is provided A DA converter in which the N current switch cells each include: a current source having one end connected to a first power source; and first and second switch transistors differentially operating each other, each having a control terminal receiving a digital signal, the first combining node combines a current output from the first switch transistor in each current switch cell, the second combining node combines a current output from the second switch transistor in each current switch cell, the first output impedance element has ends connected to the first combining node and a second power source, the second output impedance element has ends connected to the second combining node and the second power source, the controller controls the current source in each current switch cell to reduce variation in amount of a current flowing from the first power source. | 08-22-2013 |
20130241289 | SWITCHING POWER SUPPLY DEVICE AND CONTROL CIRCUIT THEREOF - A control circuit of a switching power supply device has a first current source capable of supplying an auxiliary current to a load resistance of the switching power supply device when a load current flowing through the load resistance increases, a second current source capable of pulling in a current from the load resistance when the load current flowing through the load resistance decreases, and an auxiliary current controller configured to activate the first current source or the second current source from when a variation in the load current flowing through the load resistance is detected to have exceeded a predetermined level until a current flowing through the inductor becomes equal to the current flowing through the load resistance. | 09-19-2013 |
20130249517 | DC-DC CONVERTER AND CONTROL CIRCUIT THEREOF - A control circuit of a DC-DC converter has a voltage difference signal generator configured to generate a digital voltage difference signal depending on a voltage difference between the output voltage and a reference voltage, a PID controller configured to generate a digital PID signal for determining the duty ratio of the pulse-width modulated signal, based on the digital voltage difference signal, a phase controller configured to generate a digital phase control signal for determining a phase of the pulse-width modulated signal, based on the digital voltage difference signal, and a PWM generator configured to generate the pulse-width modulated signal, based on the digital PID signal and the digital phase control signal. | 09-26-2013 |
20130328536 | DC-DC CONVERTING CIRCUIT - A DC-DC converter converts an input voltage into an output voltage and includes an input terminal, an output terminal, a power stage, a switch driving circuit, a charge pump, and a capacitor. The power stage includes a high-side switch, a low-side switch and an inductor. The switch driving circuit generates a high-side switch driving signal and a low-side switch driving signal. The charge pump generates a first polarity current according to the high-side switch driving signal, and generates a second polarity current having an opposite polarity to the first polarity current according to the low-side switch driving signal. The capacitor generates a first voltage by integrating the first and second polarity currents generated by the charge pump. The switch driving circuit generates the high-side switch driving signal and the low-side switch driving signal according to a difference between the first voltage and a reference voltage. | 12-12-2013 |
20140046497 | CONTROLLER, POWER SUPPLY UNIT, AND POWER SUPPLY SYSTEM - According to some embodiments, there is provided a controller that performs communication with a plurality of power supply units each of which outputs electric power to a load. The controller includes a receiving unit, a control information generating unit and a transmitting unit. The receiving unit receives operation information from the power supply units by radio, the operation information being information on electric power output to the load from the power supply units, respectively. The control information generating unit generates control information to control the power supply units based on the operation information. The transmitting unit transmits the control information to the power supply units by radio. | 02-13-2014 |
20140241021 | INVERTER CONTROL CIRCUIT AND INVERTER CIRCUIT - An inverter control circuit has a quantizer configured to generate a switching signal which changes over switches of a main circuit converting a DC voltage into an AC voltage, and a filter circuit configured to generate a signal having specific transfer characteristic by using a signal correlated with an output voltage of an LC filter which smooths the AC voltage and an instruction signal corresponding to a target value of an output voltage of the main circuit, wherein the quantizer generates the switching signal by quantizing an output signal of the filter circuit. | 08-28-2014 |
20140340061 | DC-DC CONVERTER CONTROL CIRCUIT AND DC-DC CONVERTER - A DC-DC converter control circuit has an inductor configured to be interposed between a first node which is set to a first direct current voltage or a second direct current voltage and a second node which outputs an output voltage at a predetermined direct current voltage level, an error signal generator configured to generate an error signal depending on a voltage difference between a reference voltage and a voltage correlating with the output voltage, a ripple extractor configured to extract and output ripple components contained in the voltage of the first node, a single-ended signal generator configured to generate a single-ended signal based on the error signal and an output signal from the ripple extractor, and a switch drive unit configured to drive and control, based on the single-ended signal, a switch circuit which sets the first node to the first direct current voltage or the second direct current voltage. | 11-20-2014 |