| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 327103000 | Converting input voltage to output current or vice versa | 76 |
| 20080197890 | Light receiving circuit - A light receiving circuit according to the present invention includes a current control voltage generation circuit | 08-21-2008 |
| 20080218221 | ANALOG SOURCE DRIVING APPARATUS - An analog source driving apparatus including an operational amplifier, a first resistor, a second resistor, a variable gain unit and a source driver is provided. A constant gain amplifier is composed with the operational amplifier, the first resistor, and the second resistor, wherein the first resistor is coupled between the inverse input terminal of the operational amplifier and the ground, and the second resistor is coupled between the inverse input terminal and the output terminal of the operational amplifier. The variable gain unit is coupled to an analog signal and the non-inverse input terminal of the operational amplifier for adjusting the analog signal to avoid affecting the zero point position and pole position of the system. Accordingly, the analog source driving apparatus can provide a stable driving output. | 09-11-2008 |
| 20080278200 | Current Weighted Voltage Interpolation Buffer - A voltage interpolation buffer for interpolating voltages by adjusting ratio of bias currents includes a first difference voltage to current unit for outputting corresponding difference current according to a first voltage, a first bias current and voltage of a voltage output end, a second difference voltage to current unit for outputting corresponding difference current according to a second voltage, a second bias current and the voltage of the voltage output end, and a current to voltage unit coupled to the first difference voltage to current unit, the second difference voltage to current unit and the voltage output end for outputting a interpolation result of the first voltage and the second voltage corresponding to a ratio of the first bias current and the second bias current according to the difference currents outputted by the first difference voltage to current unit and the second difference voltage to current unit. | 11-13-2008 |
| 20080315925 | ISOLATOR CIRCUIT INCLUDING A VOLTAGE REGULATOR - An apparatus includes a regulator circuit that generates a voltage in response to an input current being supplied to an input terminal and functional circuitry, powered by the voltage generated by the regulator circuit. The functional circuitry, e.g., an oscillator, generates a signal using the generated voltage, the signal indicative that the current is being supplied to the apparatus. The signal can be provided over an isolation link to provide a control signal for controlling a high voltage driver circuit. | 12-25-2008 |
| 20090033373 | Circuit and Method for Trimming Integrated Circuits - A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined. | 02-05-2009 |
| 20090079470 | Pseudo-differential, temperature-insensitive voltage-to-current converter - A Voltage-to-Current converter includes a current mirror having first and second poles, a first transistor coupled between the first pole of the current mirror and a low voltage through a first resistor, a second transistor coupled between the second pole of the current mirror and a low voltage through a second resistor wherein the second resistor is substantially identical with the first resistor, and wherein the output current is dependent on resistance of the first resistor, the input voltage signal applied to the gate of the first transistor, and a reference voltage signal applied to the gate of the second resistor. | 03-26-2009 |
| 20090091356 | Current-mode differential transmitter and receiver - A current-mode differential transmitter, receiving a single-end input voltage signal and accordingly generating a differential output current signal, is provided. The transmitter includes a first switch, a second switch and a current mirror. The first switch is coupled in a first current path and controlled by the single-end input voltage signal. The second switch is coupled in a second current path and controlled by an inverted signal of the single-end input voltage signal. The current mirror mirrors a reference current to the first current path when the first switch is turned on, and mirrors the reference current to the second current path when the second switch is turned on. The differential output current signal is derived from the currents on the first and second current paths. | 04-09-2009 |
| 20090096489 | HIGH VOLTAGE TOLERANT OVER-CURRENT DETECTOR - A system comprising an over-current detector configured to receive a switching voltage signal and to produce a first and a second current signal; an current-to-voltage converter configured to convert the first and second current signals into a first and a second voltage signal; and a current mirror amplifier configured to utilize the first and second voltage signals to output an over-current condition signal when the switching signal has exceeded a threshold value. | 04-16-2009 |
| 20090096490 | Transconductor - A transconductor to convert an input voltage to an output current, includes: a primary transconductance stage to provide the output current from the input voltage and a driving current; an adaptive transconductance stage coupled in series with the primary transconductance stage to generate the driving current from the input voltage; and a bias circuit coupled to provide a primary bias voltage to the primary transconductance stage and an adaptive bias voltage to the adaptive transconductance stage. | 04-16-2009 |
| 20090115461 | CURRENT CONVERTING METHOD, TRANSCONDUCTANCE AMPLIFIER AND FILTER CIRCUIT USING THE SAME - The present invention is intended to achieve a transconductance amplifier and a voltage/current converting method which can provide a sufficient amplitude and a high degree of design freedom. The method comprises the steps of converting a first voltage signal to a first current signal; converting a second voltage signal to a second current signal; obtaining the common-mode components of the first and second current signals; and subtracting the common-mode components from the first and second current signals to obtain third and fourth signals, and further, subtracting the fourth current signal from the third current signal to generate a first output, while subtracting the third current signal from the fourth current signal to generate a second output. | 05-07-2009 |
| 20090140775 | Multiplexing circuit - A multiplexing circuit comprising an converter for converting an input voltage signal to an input current signal. A plurality of first current mirrors for mirroring the input current signal. A switching unit selectively switches each first current mirror to a corresponding output. | 06-04-2009 |
| 20090140776 | Voltage-current converter and voltage controlled oscillator - An exemplary aspect of an embodiment of the present invention is a voltage-current converter converting an input voltage input to an input terminal to a current to output the current, the voltage-current converter including a first current generating circuit including an input transistor having a gate connected to the input terminal and generating an output current according to a current flowing in the input transistor, and a second current generating circuit including a transistor having a gate having a potential different from potential of a source and a drain, the second current generating circuit generating a superimposed current according to the current flowing in the transistor to supply the superimposed current to the input transistor. | 06-04-2009 |
| 20090167365 | METHOD FOR REGULATING A VOLTAGE AND CIRCUIT THEREFOR - A regulator circuit and a method for regulating an output voltage. The regulator circuit includes an undervoltage protection stage capable of operating in a plurality of operating modes. In one mode, the undervoltage protection stage compensates for a low undervoltage appearing in the output voltage and in another mode it compensates for a large undervoltage appearing in the output voltage. When the output voltage has a low undervoltage, a portion of the current from a current source is routed to a feedback network to balance the input voltages of the undervoltage protection stage and to place the voltage regulator in a steady state operating mode. When the output voltage has a large undervoltage, the undervoltage protection stage turns on a current sourcing transistor that cooperates with the current from the current source to quickly charge a compensation capacitor and increase the power appearing at the output of the voltage regulator. | 07-02-2009 |
| 20090189650 | PLL circuit including voltage controlled oscillator having voltage-current conversion circuit - A Phase-Locked Loop (PLL) circuit includes a voltage-controlled oscillator. The voltage-controlled oscillator includes a voltage-current conversion circuit and a current-controlled oscillation circuit. The voltage-current conversion circuit includes an input transistor having a gate terminal connecting a control voltage, a first transistor connected in series to the input transistor, a second transistor connected as a current-mirror to the first transistor, to generate a control current, and a current source connected in parallel to the first transistor. The current-controlled oscillation circuit oscillates at a frequency according to the control current. | 07-30-2009 |
| 20090243664 | Data transfer method, data transfer circuit, output circuit, input circuit, semiconductor device, and electronic apparatus - A data transfer circuit comprises a voltage/current converter circuit for converting a first binary voltage data of n bits (n is an integer equal to or larger than two) to multi-value current data of 2 | 10-01-2009 |
| 20090261864 | CURRENT MODE DATA SENSING AND PROPAGATION USING VOLTAGE AMPLIFIER - A method and a circuit for current mode data sensing and propagation by using voltage amplifier are provided. Example embodiments may include providing an output signal from a voltage amplifier in response to the voltage amplifier receiving an input signal. The method may include providing a current output signal from a voltage-to-current converter in response to the voltage-to-current converter receiving the output signal. The output signal may be used to drive a current sense amplifier. | 10-22-2009 |
| 20090273374 | HIGH LINEARITY VOLTAGE TO CURRENT CONVERSION - A system and method for performing voltage to current conversion, the system comprising of a first set of devices that senses the input voltage signal through its input terminal and replicates said input voltage across a second set of devices which then converts said replicated input voltage signal to an output current signal; a third set of devices that transfers the output current signal to output terminals; a differential feedback loop comprising an amplifier positioned between a first one of the first set of devices and a first one of the third set of devices; and a common mode feedback loop that regulates the output average voltage to a reference voltage. | 11-05-2009 |
| 20090295434 | SIGNAL RECEIVING DEVICE - A signal receiving device includes: a first conversion unit comprising a first input terminal to which a signal including a voltage signal and a reference voltage is inputted, and a first output terminal which output a first current signal voltage-current converted from the signal; a second conversion unit comprising a second input terminal to which the reference voltage is inputted, and a second output terminal which output a second current signal voltage-current converted from the reference voltage; a current mirror circuit comprising a third input terminal to which the second current signal is inputted, and a third output terminal which output a third current signal corresponding to the second current signal; and an output unit connected to both the first and third output terminals. | 12-03-2009 |
| 20100060324 | VOLTAGE/CURRENT CONVERSION CIRCUIT - Provided is voltage/current conversion circuit including: first and second capacitors; first and second resistors each connected to input terminal; first and second current sources; third and fourth resistors connected to current sources; differential amplifier for controlling the current sources; control unit for performing control, in first state, the input terminal is connected to the first and second capacitors; one input of the differential amplifier is connected to the first resistor and output of the first current source; the other input of the differential amplifier is connected to the second resistor and output of the second current source, and in second state, the second capacitor is connected between the output of the first current source and the one input of the differential amplifier, the first capacitor is connected between the output of the second current source and the other input of the differential amplifier. | 03-11-2010 |
| 20100097104 | CONTROL CIRCUIT HAVING OFF-TIME MODULATION TO OPERATE POWER CONVERTER AT QUASI-RESONANCE AND IN CONTINUOUS CURRENT MODE - A control circuit is developed to adaptively operate a power converter at quasi-resonance (QR) and in a continuous current mode (CCM) to achieve high efficiency. The control circuit includes a PWM circuit generating a switching signal coupled to switch a transformer. A signal generation circuit generates a ramp signal and a pulse signal. The pulse signal is generated in response to the ramp signal for switching on the switching signal. A feedback circuit produces a feedback signal according to an output load of the power converter. The feedback signal is coupled to switch off the switching signal. A detection circuit is coupled to the transformer for generating a valley signal in response to the waveform of the transformer. The valley signal is further coupled to generate the pulse signal when the ramp signal is lower than a threshold. The level of the threshold is correlated to the feedback signal. | 04-22-2010 |
| 20100109713 | CURRENT BALANCING CIRCUIT AND METHOD - A multi-phase power converter and a method for balancing a plurality of currents in the multi-phase power converter. The multi-phase power converter that includes a pulse width modulator coupled to an oscillator. A plurality of currents are generated in response to output signals from the pulse width modulator. The levels of the currents are sensed and a sense signal is transmitted to the pulse width modulator. Switching circuitry within the pulse width modulator switches signals from the oscillator in accordance with the current levels, the levels of the signals from the oscillator, and whether at least one of the signals from the oscillator is either rising or falling. | 05-06-2010 |
| 20100127735 | MIXER CIRCUIT AND MIXER CIRCUIT ARRANGEMENT - A mixer circuit is provided. The mixer circuit comprises: a voltage-to-current converter stage; a switching stage comprising a plurality of switches, the switching stage being coupled with the voltage-to-current converter stage to controlled passing electrical current from the voltage-to-current converter stage through the switches; and a frequency conversion stage coupled to the switching stage. A mixer circuit arrangement is also provided. | 05-27-2010 |
| 20100156471 | SCALABLE COST FUNCTION GENERATOR AND METHOD THEREOF - A cost function generator circuit includes memory terms each receiving one or more input signals, and each providing inphase and quadrature output current signals. The inphase and quadrature output currents of the memory terms are summed to provide combined inphase and quadrature output currents, respectively. Transimpedance amplifiers are provided to transform the combined inphase and quadrature output currents into an inphase output voltage and a quadrature output voltage. | 06-24-2010 |
| 20100164553 | CURRENT SENSING CIRCUIT - A current sensing circuit includes a power transistor, a sensing transistor configured to copy a current flowing through the power transistor at a predetermined ratio, a current sensing resistor configured to detect a voltage from the current copied by the sensing transistor, an input resistor configured to convert an input voltage to a current, a cross self-biasing cascade block configured to adjust currents at both ends of the input resistor, and a common gate transistor and a reference resistor configured to convert a current output of the input resistor to a final sense voltage. | 07-01-2010 |
| 20100164554 | FILTER CIRCUIT, CONTINUOUS TIME FILTER, AND SIGNAL REPRODUCING APPARATUS - According to one embodiment, a filter circuit includes: a first circuit to convert an input voltage into a current using a transfer conductance as a conversion coefficient; a capacitor connected to an output terminal of the first circuit; a second circuit connected to the first circuit and capacitor, and configured to convert an input voltage into a current using a transfer conductance as a conversion coefficient; a setting circuit to adjust the transfer conductance of the first circuit from a first signal and a second signal for gain adjustment and generate a third signal for gain adjustment. The output terminal of the first circuit is connected to an output terminal of the second circuit from which a signal inverted with respect to a signal output from the first circuit is output, the first signal is input to the second circuit, and a frequency band is adjusted by the first signal. | 07-01-2010 |
| 20100176847 | VOLTAGE-CURRENT CONVERTER AND FILTER CIRCUIT USING SAME - The voltage-current converter of the present invention includes a converter input terminal, a converter output terminal, a voltage-current conversion unit for converting voltage that is applied as input to the converter input terminal to current, and a current extraction unit for intermittently extracting current from the output terminal of the voltage-current conversion unit and supplying this current as output from the converter output terminal. | 07-15-2010 |
| 20100194443 | dB-LINEAR VOLTAGE-TO-CURRENT CONVERTER - A dB-linear voltage-to-current (V/I) converter that is amenable to implementation in CMOS technology. In a representative embodiment, the dB-linear V/I converter has a voltage scaler, a current multiplier, and an exponential current converter serially connected to one another. The voltage scaler supplies an input current to the current multiplier based on an input voltage. The current multiplier multiplies the input current and a current proportional to absolute temperature and supplies the resulting current to the exponential current converter. The exponential current converter has a differential MOSFET pair operating in a sub-threshold mode and generating an output current that is proportional to a temperature-independent, exponential function of the input voltage. | 08-05-2010 |
| 20100271077 | LIGHT RECEIVING CIRCUIT - A light receiving circuit in accordance with an exemplary aspect of the present invention includes a photodiode | 10-28-2010 |
| 20100289532 | ADAPTATION CIRCUIT FOR CONTROLLING A CONVERSION CIRCUIT - Adaptation circuits ( | 11-18-2010 |
| 20100289533 | VOLTAGE CURRENT CONVERTER, DIFFERENTIATION CIRCUIT, INTEGRATION CIRCUIT, AND FILTER CIRCUIT USING THE CONVERTER, AND VOLTAGE CURRENT CONVERSION METHOD - It is possible to provide a voltage-current converter which can realize a variable filter having a steep cut-off characteristic with a small area. The voltage-current converter includes: one or more sampling/holding units for sampling an inputted voltage and holding the sampled voltage; one or more separate voltage-current conversion units for outputting a current corresponding to the voltage held by the sampling/holding units; and a control unit for controlling the timing of the sampling and holding of the inputted voltage by the sampling/holding units. | 11-18-2010 |
| 20100301904 | NON-LINEAR INTERPOLATION CIRCUIT, INTERPOLATION CURRENT GENERATING CIRCUIT THEREOF AND METHOD FOR CONVERTING DIGITAL DATA INTO ANALOG DATA - A non-linear interpolation circuit includes current interpolation units and an I-V converter. The current interpolation units receive an operating voltage corresponding to digital image data and corresponding reference voltages to generate corresponding operating currents. When the operating voltage changes, at least one of the corresponding current interpolation units generate the corresponding operating current, and the operating currents with respect to the operating voltage are superimposed to form an interpolation current. The I-V converter converts the interpolation current into an interpolation voltage. An interpolation current generating circuit and a method for converting digital data into analog data are also disclosed herein. | 12-02-2010 |
| 20100321067 | Programmable Gain Amplifier - A programmable gain amplifier comprising alternatively selectable parallel circuits in a front end and independently selectable serial amplification circuits in a back end. The front end may include, for example, a plurality of transconductors in parallel and each configured to generate a current proportional to a received voltage. A ratio of the generated current to the received voltage being different for each of the transconductors. The back end is configured to receive an output of a selected member of the parallel circuits and may include a plurality of current or voltage mode amplifiers in series. For example, the back end may include a plurality of current-mode gain stages and switches configured to control which of the current-mode gain stages are used to amplify the output of the front end. The programmable gain amplifier may be used between a signal receiver and an analog to digital converter. | 12-23-2010 |
| 20110001519 | SYSTEM FOR CONVERTING CHARGE INTO VOLTAGE AND METHOD FOR CONTROLLING THIS SYSTEM - The invention relates to controlling a device for converting charge into voltage comprising an amplifier and at least one capacitor mounted in inverse feedback between an input and an output of said amplifier, whereby said amplifier can be connected between at least one input stage, to receive a charge therefrom, and at least one output stage to deliver voltage thereto, said voltage being representative of the charge received at the input, said method comprising at least one phase comprising the voltage conversion of a charge received at the input. According to the invention the conversion phase comprises at least: one first sub-phase during which the amplifier is connected to the input stage and the amplifier is disconnected from the output stage; followed, by a second sub-phase during which the amplifier is disconnected from the input stage and the amplifier is connected to the output stage. | 01-06-2011 |
| 20110018590 | FEEDBACK CIRCUIT AND CONTROL METHOD FOR AN ISOLATED POWER CONVERTER - A feedback circuit for an isolated power converter includes an opto-coupler and a reversed polarity regulator. The opto-coupler provides a current related to an output voltage of the isolated power converter. When the isolated power converter enters light load, the output voltage rises and the reversed polarity regulator reduces the current to decrease the power consumption and thus improve the light load efficiency of the isolated power converter. | 01-27-2011 |
| 20110018591 | SYSTEM FOR CONVERTING CHARGE INTO VOLTAGE AND METHOD FOR CONTROLLING THIS SYSTEM - The invention relates to controlling a device for converting charge into voltage comprising an amplifier and at least one capacitor mounted in inverse feedback between an input and an output of said amplifier, whereby said amplifier can be connected between at least one input stage, to receive a charge therefrom, and at least one output stage to deliver voltage thereto, said voltage being representative of the charge received at the input, said method comprising at least one phase comprising the voltage conversion of a charge received at the input. According to the invention the conversion phase comprises at least: one first sub-phase during which the amplifier is connected to the input stage and the amplifier is disconnected from the output stage; followed, by a second sub-phase during which the amplifier is disconnected from the input stage and the amplifier is connected to the output stage. | 01-27-2011 |
| 20110032004 | Light-receving circuit and semiconductor device having same - A light-receiving circuit includes a photodiode that converts an input optical signal to a current signal; a current-voltage converting circuit that outputs an output voltage signal obtained by adding a reference voltage to a voltage signal proportional to the current value of the current signal; and an input current limiting unit that supplies the current-voltage converting circuit with the current signal upon limiting the current value of this current signal based upon the reference voltage in such a manner that the output voltage signal will not exceed a constant value irrespective of the value of the reference voltage. | 02-10-2011 |
| 20110102023 | CURRENT-TO-VOLTAGE CONVERTERS WITH DYNAMIC FEEDBACK - An apparatus for modifying an output signal indicative of a downhole parameter that may include a carrier conveyable in a wellbore; a negative error compensator; and an output signal device. The negative error compensator may be configured to modify the output of the device to increase or decrease a characteristic of the output signal from the output signal device. Also, a method for modifying an output signal indicative of a downhole parameter that may include modifying a characteristic of an output signal produced by a output signal device in a wellbore using a negative error compensator. | 05-05-2011 |
| 20110115530 | OUTPUT CURRENT DETECTING CIRCUIT AND TRANSMISSION CIRCUIT - An output current detecting circuit includes: a current detecting transistor having a size smaller than that of an output transistor and a control terminal, to which a voltage same as a control voltage of the output transistor is applied; a sensing resistor connected to the current detecting transistor in a serial mode; a comparison circuit comparing a voltage converted by the sensing resistor and a reference voltage to judge a magnitude of a current flowing through the output transistor; and a reference voltage generating circuit, wherein the reference voltage generating circuit includes a constant current circuit flowing a constant current and a resistance element having one terminal connected to a power source voltage terminal, the reference voltage generating circuit generating the reference voltage based on a power source voltage by the conversion of the constant current into a voltage by flowing the constant current through the resistance element. | 05-19-2011 |
| 20110133787 | CIRCUIT AND METHOD FOR DETERMINING A CURRENT - A power supply circuit having a converter circuit and method for determining a current flowing into the converter circuit. A converter circuit includes an amplifier and a current-to-current converter module. The amplifier has a current sensing element coupled between its inverting and noninverting input terminals. The amplifier generates a sensing signal from a charging current flowing through the current sensing element. The sensing signal is input into the current-to-current converter module, which scales the charging current and modulates the scaled charging current. The current-to-current converter module converts the modulated current to a charging voltage that is representative of the charging current. The charging current is converted to a current that is representative of the input current to converter circuit. The input current to the converter circuit is added to an auxiliary load current to yield the current of the power supply circuit. | 06-09-2011 |
| 20110187415 | TRANSMISSION INPUT CIRCUIT - A transmission input circuit of the present invention is provided with: a current detection resistor which receives an input of a line current flowing through a transmission line and generates a line current detection voltage; a constant current circuit which generates a predetermined reference current; a first switch which performs a switching operation at an empty timing where a transmission current is not flowing, to thereby allow the reference current to flow from the constant current circuit to the current detection resistor, and generate a reference voltage, in which a threshold voltage corresponding to the reference current is added to a load current detection voltage corresponding to the load current; a capacitor which is connected to the current detection resistor via the first switch; a second switch which performs a switching operation in synchronization with the first switch to thereby sample-hold the reference voltage generated by the current detection resistor in the capacitor; and a comparator which receives an input of the line current detection voltage generated by means of the current detection resistor, to one of input terminals, receives an input of the reference voltage held in the capacitor to an other input terminal, and outputs a voltage component of the line current detection voltage which exceeds the reference voltage, as a transmission current detection signal. | 08-04-2011 |
| 20110241734 | COUPLING TOLERANT PRECISION CURRENT REFERENCE WITH HIGH PSRR - Embodiments of the present invention are related to circuits and methods for generating a reference current (Idc). In an embodiment, a voltage-to-current converter circuit is used to generate the reference current (Idc) in dependence on a reference voltage (Vref) and a precision resistor (R | 10-06-2011 |
| 20110248747 | ZERO-TEMPERATURE-COEFFICIENT VOLTAGE OR CURRENT GENERATOR - General speaking, a resistor of high resistivity has a negative-temperature-coefficient and a resistor of low resistivity has a positive-temperature-coefficient. Utilizing this characteristic, an appropriate proportion between the above resistors can be found to make a combined resistor with an approximate zero-temperature-coefficient. The combined resistor can be used to design a circuit for generating voltage and current with approximate zero-temperature-coefficients. | 10-13-2011 |
| 20110267111 | WIDE DYNAMIC RANGE, WIDE BANDWIDTH, VOLTAGE TO CURRENT CONVERTER - A voltage to current converter comprising a composite amplifier arrangement having a common-base transistor for providing voltage to current conversion, the input current to common-base transistor is corrected to account for the temperature drift of the transistor and variations in the bias supply voltage. | 11-03-2011 |
| 20120001659 | Voltage-to-Current Converter with Feedback - A voltage-to-current converter includes a transconductance stage including an input configured to receive a scaled voltage signal, a first output to carry a first current based on the scaled voltage signal, and a second output to carry a second current that is proportional to the first current. The voltage-to-current converter further includes a digital feedback loop coupled to the second output of the transconductance stage and configured to adjust the scaled voltage signal based on an error between an external reference voltage and a sense voltage derived from the second current to compensate for changes in the scaled voltage signal. | 01-05-2012 |
| 20120043995 | Detection Circuit - A detection circuit is disclosed in specification and drawing, where the detection circuit includes a current source, a voltage-current converter and a current comparator. The voltage-current converter is configured to acquire a receiving current from the current source by comparing a reference voltage with an input voltage of a detecting terminal. The current comparator is configured to output an output voltage by comparing a steady current with an output current based on the receiving current. | 02-23-2012 |
| 20120043996 | LINEAR TRANSCONDUCTOR FOR RF COMMUNICATIONS - The present patent application comprises a linear transconductor having at least one input and at least one output, comprising a differential amplifier having a plurality of transistors and a plurality of inputs, wherein a difference of input signals is amplified, a cascode circuit having a plurality of transistors, wherein the transistors are operably connected to the differential amplifier, wherein reverse isolation between an input and an output of the linear transconductor is improved by decoupling the input and the output of the linear transconductor by mounting at least one transistor of the plurality of transistors of the cascode circuit as a common-gate stacked on the at least one transistor of the differential amplifier, an active load having a plurality of transistors operably connected between the cascode circuit and supply voltage, and an auxiliary device operably connected to the connection between the active load, the cascode device and ground. | 02-23-2012 |
| 20120081154 | CURRENT CONTROL CIRCUIT - A plurality of current control MOS transistors and a plurality of current detection systems are provided, each of the current detection systems including a current detection transistor current-mirror connected to the current control MOS transistor and a current-voltage converter connected in series to the current detection transistor. The current detection systems are switched between one another for operation in response to the intensity of a charging current flowing through the current control transistors. | 04-05-2012 |
| 20120098573 | CURRENT DETECTION CIRCUIT FOR A POWER SEMICONDUCTOR DEVICE - A current detection circuit for a power semiconductor device utilizes a sense function of the power semiconductor device. The magnitude of current flowing in power semiconductor devices | 04-26-2012 |
| 20120098574 | FILTER CIRCUIT AND OPTICAL DISK DEVICE INCLUDING THE SAME - A current-mode filter includes a first, a second, and a third transistor having the same channel polarity. The drain of the first transistor is connected to the source of the second transistor functioning as a gate grounded circuit. The drain of the second transistor is connected to the gates of the first and third transistors. A first and a second capacitive element are connected to the gate and drain of the first transistor. The current source supplies a bias current to each of the first and second transistors. The drain of the first transistor is used as an input terminal. An output signal is extracted from a drain current of the third transistor. Therefore, only one transconductance adjustment circuit is enough. | 04-26-2012 |
| 20120112797 | VOLTAGE SENSING CIRCUIT WITH REDUCED SUSCEPTIBILITY TO GAIN DRIFT - A voltage sensing circuit includes a voltage to current converter, an integrator, a sample and hold amplifier, and a modulator. The voltage to current converter produces a modulated current corresponding to an input voltage. The integrator demodulates the modulated current and produces a voltage sum of the demodulated current. The sample and hold amplifier samples the voltage sum and provides an output voltage corresponding to the voltage sum. The modulator modulates the output voltage and provides the modulated voltage to the voltage to current converter as a feedback voltage. | 05-10-2012 |
| 20120112798 | CURRENT-TO-VOLTAGE CONVERTER, RECEIVER, METHOD FOR PROVIDING A VOLTAGE SIGNAL AND METHOD FOR RECEIVING A RECEIVED SIGNAL - A current-to-voltage converter for providing a voltage signal based on a current signal has a first active stage having an input and an output. The first active stage is configured to receive the current signal at its input and provide the voltage signal at its output. In addition, the current-to-voltage converter has a second active stage that is coupled between the output of the first active stage and the input of the first active stage. The second active stage is configured to provide the input of the first active stage with a feedback signal that frequency-selectively counteracts amplification, by the first active stage, of signal components of a current signal applied to the input of the first active stage that have a frequency outside of a prescribed useful frequency band. | 05-10-2012 |
| 20120268169 | DIFFERENTIAL CURRENT SIGNAL CIRCUIT - A differential current signal circuit is described which includes a voltage to differential current converter circuit that generates a differential pair of current output signals in response to receiving a voltage input signal, where the differential pair of current output signals are linearly proportional to the voltage input signal within a voltage operating range from a minimum operating voltage to a maximum operating voltage. The differential pair of current output signals are linear over a wide range of voltage input signals. A correction circuit is included which eliminates voltage offsets in the voltage operating range due to process and temperature variations. The correction circuit also provides the capability to adjust the minimum operating voltage, and eliminates variations in the minimum operating voltage due to process and temperature variations. | 10-25-2012 |
| 20120274365 | RECEIVING CIRCUIT HAVING A LIGHT RECEIVING ELEMENT WHICH RECEIVES A LIGHT SIGNAL - According to one embodiment, a receiving circuit is provided. The receiving circuit has a first light receiving element, a signal voltage generator, a second light receiving element, a delay element and a comparator. The first light receiving element receives a light signal and converts the light signal into a first current. The signal voltage generator converts the first current into a signal voltage. The second light receiving element receives the light signal and converts the light signal into a second current. The reference voltage generator converts the second current into a voltage and outputs the voltage as a reference voltage. The delay element delays and reduces a signal component of the reference voltage. The comparator compares the signal voltage from the signal voltage generator with a threshold voltage based on an output voltage of the delay element. | 11-01-2012 |
| 20120286827 | VOLTAGE-TO-CURRENT CONVERTER CIRCUIT - A voltage-to-current converter circuit has a differential input unit, and is provided with an input offset voltage, wherein the temperature characteristics of the differential input unit and input offset voltage are substantially flat. A current is supplied wherein a second fixed current having positive temperature characteristics is added to a first fixed current having flat characteristics as a bias current to the differential input unit, to balance the temperature characteristics of the differential input unit and the temperature characteristics of the bias current, thus causing the differential input unit transconductance temperature characteristics to be substantially zero (e.g., substantially flat). | 11-15-2012 |
| 20120293212 | LOW POWER REFERENCE CURRENT GENERATOR WITH TUNABLE TEMPERATURE SENSITIVITY - An improved reference current generator is provided. A voltage difference generator generates two voltages that are separated by a relatively small electrical potential. The two closely separated voltages are applied across a resistive element with relatively large impedance value resulting in a small and stable reference current. The result is a power efficient, temperature compensated reference current generator. | 11-22-2012 |
| 20120306541 | HIGH-SIDE SIGNAL SENSING CIRCUIT - The present invention provides a high-side signal sensing circuit. The high-side signal sensing circuit comprises a signal-to-current converter, a second transistor and a resistor. The signal-to-current converter has a first transistor generating a mirror current in response to an input signal. The second transistor cascaded with the first transistor is coupled to receive the mirror current. The resistor generates an output signal in response to the mirror current. Wherein, the level of the output signal is corrected to the level of the input signal. | 12-06-2012 |
| 20130057317 | HIGH LINEARITY UP-CONVERSION MIXER - A high linearity up-conversion mixer is disclosed, which includes a voltage-to-current conversion circuit and an up-conversion mixer core circuit, the voltage-to-current conversion circuit has a differential signal positive input end for receiving an I/Q-channel positive baseband voltage signal and a differential signal negative input end for receiving an I/Q-channel negative baseband voltage signal, wherein the received positive and negative baseband voltage signals are low pass filtered by the voltage-to-current conversion circuit and are respectively converted to a first and a second current signal; the first and the second current signals are inputted to the up-conversion mixer core circuit to mix with local oscillator signals so as to output high linearity frequency-mixed signals. By embedding low-pass filters into the voltage-to-current conversion circuit of the up-conversion mixer, the present invention can ensure the high linearity of the up-conversion mixer while reduce the chip area and the current. | 03-07-2013 |
| 20130076403 | VOLTAGE-TO-CURRENT CONVERTER - A conversion circuit includes a super source follower circuit configured to lower an impedance of a first node. A digital control circuit is configured to adjust a current at the first node based on a current through the super source follower. An output transistor has a gate configured to receive a first signal. A drain of the output transistor is coupled to a first node, and a source of the output transistor is configured to output an output current based on a voltage of the first signal. | 03-28-2013 |
| 20130222014 | DIFFERENTIAL CURRENT SIGNAL CIRCUIT - A differential current signal circuit is described which includes a voltage to differential current converter circuit that generates a differential pair of current output signals in response to receiving a voltage input signal, where the differential pair of current output signals are linearly proportional to the voltage input signal within a voltage operating range from a minimum operating voltage to a maximum operating voltage. The differential pair of current output signals are linear over a wide range of voltage input signals. A correction circuit is included which eliminates voltage offsets in the voltage operating range due to process and temperature variations. The correction circuit also provides the capability to adjust the minimum operating voltage, and eliminates variations in the minimum operating voltage due to process and temperature variations. | 08-29-2013 |
| 20130257484 | VOLTAGE-TO-CURRENT CONVERTER - A voltage-to-current converter is described. In one embodiment, the voltage-to-current converter includes an operational amplifier, where a first input of the operational amplifier is coupled to a first node and a second input of the operational amplifier is coupled to a reference voltage. The input voltage is connected to the first node through a resistor which generates the input current. The voltage-to-current converter also includes a first transistor coupled to a first node and to an output of the operational amplifier, where the input current flows through the first transistor. The voltage-to-current converter also includes a second transistor coupled to the first transistor, to the output of the operational amplifier, and to an output node, where an output current flows through the second transistor. The first and second transistors constitute a current mirror to provide additional current gain for the output current. | 10-03-2013 |
| 20130265083 | VOLTAGE AND CURRENT REFERENCE GENERATOR - A voltage and current reference generator includes: a temperature-insensitive voltage source for providing a first current with a positive temperature coefficient and a reference voltage with a substantially zero temperature coefficient according to a junction voltage difference with a negative temperature coefficient; a mirror unit for mirroring the first current to obtain a second current with the positive temperature coefficient and for generating a junction voltage with the negative temperature coefficient according to the second current; a voltage-to-current conversion unit for converting the junction voltage into a third current with the negative temperature coefficient; and a current integration unit for obtaining a fourth current and a fifth current, and integrating the fourth current and the fifth current into a reference current having a substantially zero temperature coefficient. | 10-10-2013 |
| 20130321030 | MOVING AVERAGE FILTER BASED ON CHARGE SAMPLING AND MOVING AVERAGE FILTERING METHOD USING THE SAME - The present invention relates to a movement average filter based on charge sampling and a moving average filtering method using the same. The moving average filter includes a voltage-current converter and a first sampling unit. The voltage-current converter converts an input voltage signal into an input current signal and outputs the input current signal. The first sampling unit includes a first 1-unit sampler, an α-unit sampler, and a second 1-unit sampler connected in parallel between an output terminal of the voltage-current converter and a filtered signal output terminal, wherein each of the first 1-unit sampler, the α-unit sampler, and the second 1-unit sampler has a sampling capacitor bank for performing charge sampling. A ratio of sampling capacitances of sampling capacitor banks of the first 1-unit sampler, the α-unit sampler, and the second 1-unit sampler is 1:α:1, wherein a is adjusted to have a value between 1 and 2. | 12-05-2013 |
| 20140015568 | SEMICONDUCTOR INTEGRATED CIRCUIT APPARATUS AND RADIO-FREQUENCY POWER AMPLIFIER MODULE - In a semiconductor integrated circuit apparatus and a radio-frequency power amplifier module, a log detection portion including multiple-stage amplifier circuits, multiple level detection circuits, adder circuits, and a linear detection portion including a level detection circuit are provided. Output current from the log detection portion and output current from the linear detection portion are multiplied by different coefficients and the results of the multiplication are added to each other to realize the multiple detection methods. For example, current resulting from multiplication of the output current from the log detection portion by ×6/5 is added to the output current from the linear detection portion to realize a log detection method and, current resulting from multiplication of the output current from the log detection portion by ×1/5 is added to current resulting from multiplication of the output current from the linear detection portion by ×3 to realize a log-linear detection method. | 01-16-2014 |
| 20140062536 | OUTPUT MODULE AND METHOD FOR OPERATING THE OUTPUT MODULE - A method for operating an output module having an output circuit by which a voltage resulting in a current is connected to a load connected to an output, wherein a first driver module is operated and activated via a first control input to connect a voltage to the output, a second driver module is operated in parallel with the first driver module and activated via a second control input to also connect a voltage to the output, at a start time a control circuit receives a switching command for switching the voltage to the output, and wherein the control circuit initially starts by reciprocally activating the first and second control inputs respectively for a first time period, and wherein during this reciprocal activation, the first and second driver modules conduct the current for each respective duration of first and second activation periods. | 03-06-2014 |
| 20140197866 | Voltage to Current Converter - The invention provides a voltage to current converter that contains an diode-connected NMOS transistor, a diode-connected PMOS transistor, and a voltage-controlled signal input circuit. The source of the NMOS transistor and the drain of the PMOS transistor are connected together and connected to the voltage-controlled signal input circuit in series. The invention is implemented and tested in the integrated circuit. When an input voltage signal is inputted, a current of the PMOS transistor is substantially linearly proportional to the input voltage signal. | 07-17-2014 |
| 20140218071 | Low Power Tunable Reference Current Generator - An improved reference current generator for use in an integrated circuit. A voltage difference generator generates two voltages that are separated by a relatively small electrical potential. The two closely separated voltages are applied across a resistive element with relatively large impedance value resulting in a small and stable reference current. The stable reference current is mirrored and, if desired, amplified for use on the integrated circuit. A driver selectively drives state information off chip for assisting in post-silicon correction of unwanted sensitivities. A configuration memory stores values used to adjust effective device widths and lengths for correcting unwanted sensitivities. | 08-07-2014 |
| 20140320172 | CURRENT-TO-VOLTAGE CONVERTER AND ELECTRONIC APPARATUS THEREOF - A current-to-voltage converter comprises a gain circuit, a flip circuit, and a chopper circuit. The gain circuit receives an input current, and amplifies the input current to generate an amplified current. The flip circuit receives the amplified current, and uses the amplified current to charge or discharge a capacitor thereof according to a charge signal and a discharge signal, so as to generate an output voltage, wherein before using the amplified current to charge or discharge the capacitor, the flip circuit resets the output voltage respectively to a charge reset voltage and a discharge reset voltage according to a charge reset signal and a discharge reset signal. When the capacitor is charged, the chopper circuit samples and holds the output voltage to generate a recovered voltage. When the capacitor is discharged, the chopper circuit samples, holds, and flips the output voltage to generate the recovered voltage. | 10-30-2014 |
| 20140333348 | CURRENT-TO-VOLTAGE CONVERTER AND ELECTRONIC APPARATUS THEREOF - A current-to-voltage converter which is used to receive an input current and to generate an output voltage accordingly comprises a current tracking bias circuit, a current-to-voltage unit, and a voltage clamp bias circuit. The current tracking bias circuit generates a first bias according to the input current. The current-to-voltage unit receives the first bias and the input current, and generates the output voltage according to the input current, wherein the first bias determines a range of the input current, the current-to-voltage unit has a first current control device, and the first current control device changes a current conduction level thereof in response to the first bias, such that a rising or falling speed of the output voltage is enhanced. The voltage clamp bias circuit clamps voltage levels of two ends where the voltage clamp bias circuit is connected to the current-to-voltage unit. | 11-13-2014 |
| 20150035565 | COMMUNICATION CIRCUIT APPARATUS AND TRANSCEIVER HAVING THE SAME - A communication circuit apparatus includes: multiple level shift circuits, each of which receives an input signal corresponding to a respective communication bus; an activation comparator for generating an activation signal when the input signal is input into one of the level shift circuits, and a level of the input signal exceeds a predetermined threshold; multiple input current voltage conversion circuits, each of which is arranged together with a respective level shift circuit, converts the input signal to a voltage signal, and outputs the voltage signal as an identification signal; and an identification circuit for identifying one of the communication busses based on the identification signal, which is output from one of the input current voltage conversion circuits. The one of the communication busses corresponds to the one of the level shift circuits, in which the input signal is input. | 02-05-2015 |
| 20150123712 | METHODS AND APPARATUSES FOR OBTAINING VOLTAGE INFORMATION BASED ON CHARGE PACKETS INPUT AT DIFFERENT TIMINGS - Disclosed is a voltage obtaining apparatus. The voltage obtaining apparatus includes a plurality of conversion units, which are connected to each other in parallel and respectively convert charge packets into voltages, and a control unit that controls a timing when the charge packets are respectively input to the plurality of conversion units. The control unit is configured to control the timing so that a corresponding charge packet is input to an nth conversion unit (where n denotes number of the conversion units) at a timing when an operation of an (n−1)th conversion unit is ended. | 05-07-2015 |
| 20150137855 | Current To Voltage Converter - An apparatus for converting current to voltage includes a pair of current inputs, a differential voltage output connected to the pair of current inputs, a current summing node connected to the pair of current inputs through a first resistor branch, a common mode feedback node connected to the pair of current inputs through a second resistor branch, an amplifier operable to generate a current control signal based at least in part on a voltage at the common mode feedback node, and a current controller operable to control a current through the current summing node based at least in part on the current control signal. | 05-21-2015 |
| 20150349753 | INTEGRATION CIRCUIT - An integration circuit according to one embodiment includes a first capacitance element, a capacitance circuit, a comparison circuit, a memory circuit and an operation circuit. The first capacitance element receives a current signal. The capacitance circuit includes a first switch and a second capacitance element, and is connected in parallel to the first capacitance element. The second capacitance element receives a current signal via the first switch. The comparison circuit compares a voltage of the first capacitance element with a reference voltage to obtain a comparison result. The memory circuit stores the comparison result, and opens or closes the first switch based on the comparison result. The operation circuit outputs a residual signal based on a difference between the integrated value obtained by the first capacitance element and the second capacitance element and a value based on the comparison result. | 12-03-2015 |
| 20160018838 | dB-LINEAR VOLTAGE-TO-CURRENT CONVERTER - A dB-linear voltage-to-current (V/I) converter is amenable to implementation in CMOS technology. In a representative embodiment, the dB-linear V/I converter has a voltage scaler, a current multiplier, and an exponential current converter serially connected to one another. The voltage scaler supplies an input current to the current multiplier based on an input voltage. The current multiplier multiplies the input current and a current proportional to absolute temperature and supplies the resulting current to the exponential current converter. The exponential current converter has a differential MOSFET pair operating in a sub-threshold mode and generating an output current that is proportional to a temperature-independent, exponential function of the input voltage. | 01-21-2016 |
| 20160020758 | DELAY CONTROL SYSTEM HAVING TOLERANCE FOR PVT VARIATION - A delay control system has a tolerance for process, voltage, and temperature (PVT) variations. The delay control system includes a detection compensation block configured to receive a constant current source, detect a PVT variation, and supply a compensation current; a current summation block configured to receive the compensation current and supply a summation current; a current-to-voltage converter configured to receive the summation current and supply a bias voltage depending on the amount of the summation current; and a delay chain block configured to adjust a delay time in response to the bias voltage. Related methods are also described. | 01-21-2016 |
| 20160087632 | CURRENT AMPLIFIER AND TRANSMITTER USING THE SAME - A current amplifier and a transmitter using the same. The current amplifier has a first and second transistor and a voltage level shifting unit. The first transistor has a gate receiving an input current and a drain receiving a driving current. The voltage level shifting unit providing a voltage shift is coupled between the drain of the first transistor and the gate of the second transistor. An output current is generated at the drain of the second transistor. | 03-24-2016 |
| 20160182017 | SINGLE ENDED CHARGE TO VOLTAGE FRONT-END CIRCUIT | 06-23-2016 |
