Abstract: 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.

Abstract: A current is generated from a reference voltage using an operational amplifier. The current is mirrored by a current mirror circuit to obtain a reference current. For example, the current mirror circuit includes a plurality of PMOS transistors. Based on the result of measurement of the reference current by an external monitor, the connection destination of the gate voltage of each of a plurality of mirror destination current source transistors is switched by an analog switch circuit between a power supply and the gate of a mirror source current source transistor, thereby changing the number of mirror destination current source transistors which are turned on, to change a current minor ratio. Thus, the current can be trimmed.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a transconductance amplifier, providing current variations di=k·dv when it receives voltage variations dv. The amplifier comprises a first MOS transistor (MN4) whose drain provides differential currents (I?di, I+di). It comprises an output stage having a second transistor (MP5) of a type opposite to the first, whose source is linked to the drain of the first, whose gate is biased at a constant potential (Vref), and whose drain receives the current variations which are provided by the first transistor and which must be applied to a sampling capacitor.

Abstract: 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 (R0), wherein Idc=Vref/R0. A capacitor (C0) is used to shunt noise that couples into the voltage-to-current converter. A frequency dependent feedback network is used to compensate for instabilities introduced by the capacitor (C0). The capacitor (C0) can be used to shunt noise that couples into the voltage-to-current converter by connecting the capacitor (C0) in parallel with the precision resistor (R0). The frequency dependent feedback network can be used to compensate for instabilities introduced by the capacitor (C0) by connecting the frequency dependent feedback network between a feedback terminal of an amplifier of the voltage-to-current converter circuit and a terminal of the capacitor (C0).

Abstract: According to an embodiment, a voltage-current converter circuit includes a first current mirror circuit, a first transistor, a variable resistor, a second transistor and a first current output unit. The first current mirror circuit includes a first conductivity type transistor supplied with a first voltage, and the first current mirror circuit is configured to produce a second electric current based on a first electric current. The first transistor has a second conductivity type, and the first electric current flows through the first transistor. One end of the variable resistor is connected to a source of the first transistor, the other end of the variable resistor is supplied with a second voltage, and a resistance value of the variable resistor changes depending on an input control voltage. The second transistor has the second conductivity type, and the second electric current flows through the second transistor.

Abstract: A MOS integrated circuit includes: a voltage-to-current conversion circuit configured to convert first and second voltages to a first current having a current value corresponding to the first voltage and a second current having a current value corresponding to the second voltage; and a current comparison circuit configured to compare the respective current values of the first and second currents and to output a voltage showing the comparison result. Oxide films of MOS transistors of the current comparison circuit are thinner than oxide films of MOS transistors of the voltage-to-current conversion circuit.

Abstract: A circuit configured to generate an analog signal having a pre-determined pattern. The circuit includes a plurality of digital-to-analog converters. Each of the plurality of digital-to-analog converters includes a plurality of current sources configured to generate a plurality of square waveforms and a summer configured to sum the plurality of square waveforms to generate the analog signal having the pre-determined pattern. Each square waveform is delayed by a pre-determined amount delay relative to another square waveform of the plurality of square waveforms. The pre-determined amount of delay between each square waveform of the plurality of waveforms is adjustable to adjust the pre-determined pattern of the analog signal. The pre-determined amount of delay is non-uniform throughout the circuit.

Abstract: 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

Abstract: The present invention discloses a multi-chip module with master-slave analog signal transmission function. The multi-chip module comprises: a master chip having a first setting input pin for receiving an analog setting signal to generate an analog setting in the master chip, and the master chip duplicating the analog setting to output a first analog output; and a first slave chip for receiving the first analog output from the master chip to generate an internal setting of the first slave chip.

Abstract: A current balance circuit includes a first and a second current sensors, an averager, a first and a second control modules, and a first and a second rheostat elements. The first and second current sensors receive a first current and a second current from a power source respectively and convert the first and second currents into a first and a second voltages. The averager receives the first and second voltages and calculates to obtain an average voltage. The first and second control modules receive the first voltage, the second voltage, and the average voltage, to obtain a first and a second control signals, to control current conduction ability of the first and second rheostat elements, to make the first and second currents keep a dynamic balance.

Abstract: 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.

Abstract: 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.

Abstract: An interpolation circuit for comparing an input voltage signal with an interpolated reference signal derived from a first reference voltage signal and a second reference voltage signal may include a transconductive circuit configured to generate a first differential current signal proportional to a difference between the first reference voltage signal and the input voltage signal and a second differential current signal proportional to a difference between the second reference voltage signal and the input voltage signal, an intermediate circuit configured to generate a third differential current signal, and a transinductive circuit configured to generate an output voltage signal having a first polarity if a value of the input voltage signal is greater than a value of the interpolated reference signal and a second polarity if the value of the input signal is less than the value of the interpolated reference signal.

Abstract: 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.

Abstract: A buffer circuit includes a first transistor (T1) having a base connected to a first power supply, the emitter (E1) and collector (C1) connected as input and output nodes, a second transistor (T2) having a base connected to the first power supply, a first constant current circuit using a difference between outgoing current from E1 and an input current at the current signal input node as a constant current, and determining outgoing current from the emitter of T2 equal to the constant current; and a first mirror circuit equalizing first and second collector currents with a third transistor (T3) with C1 and a fourth transistor (T4) with a collector connected to a collector of T2, a first operating point voltage is provided to the current signal output node between T3 and T1, and a second operating point voltage based on the first operating point voltage between T4 and T2.

Abstract: A semiconductor device that includes transmitter circuits and receiver circuits that share a common data line and method is disclosed. Each transmitter circuit may include a frequency modulator that receives a stream of data and provides a frequency modulated data output at a predetermined carrier frequency. Each receiver may include a band pass filter that allows a corresponding frequency modulated data output from a corresponding transmitter circuit to pass through to a demodulator while essentially excluding the other frequency modulated data. In this way, a plurality of transmitter circuits can simultaneously transmit data with each one of the plurality of transmitter circuits transmitting data to a predetermined receiver circuit.

Abstract: 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.

Abstract: A circuit for detecting an input voltage includes a voltage-to-current converter and a current comparator. The voltage-to-current converter is operable for generating a monitoring current that varies in accordance with the input voltage. The current comparator coupled to the voltage-to-current converter is operable for comparing the monitoring current to a threshold current proportional to the temperature of the circuit, and for generating a detection signal indicating a condition of the input voltage based on a result of the comparison.

Abstract: 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.

Abstract: A switching regulator for fixing a frequency which includes a power stage circuit, for receiving an input voltage and outputting an output voltage according to an control signal; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant-time trigger circuit for outputting the control signal according to the comparing result and a compensating signal; an a frequency compensator for outputting the compensating signal according to the output voltage and a phase signal; wherein the phase signal is corresponding to the magnitude of the voltage across the lower gate switch of the power stage circuit.

Abstract: An integrated circuit transimpedance amplifier arrangement constituted of: a plurality of internal matched resistors; a current multiplier arranged to output a signal whose value is a function of an input current signal, an external resistor and a first set of the plurality of internal matched resistors; and an output transimpedance amplifier coupled to the output of the current multiplier, the output transimpedance amplifier exhibiting a gain whose value is a function of a second set of the plurality of internal matched resistors, wherein the output of the output transimpedance amplifier is a function of the input current signal, the external resistor, the first set of the plurality of internal matched resistors and the second set of the plurality of internal matched resistors, wherein the variations with temperature of the first set of the plurality of internal matched resistors and the second set of the plurality of internal matched resistors cancel.

Abstract: A high linearity voltage-current converter able to compensate for mobility degradation comprises a first constant current source circuit, a first current mirror unit, a second constant current source circuit, a second current mirror unit, a seventh MOS transistor and an eighth MOS transistor. The first current mirror unit is coupled to the first constant current source circuit, and the second current mirror unit is coupled to the second constant current source circuit. The seventh MOS transistor, the first current mirror unit and the second current mirror unit are coupled to each other at a third joint point of a first conducting wire. The eighth MOS transistor is coupled to the seventh MOS transistor. Thereby, the electronic components used in the present invention can operate more efficiently.

Abstract: A voltage-current converting converts a voltage signal into a current signal. In an example operation, a source of a transistor is connected to a first power source, the source is connected to an input terminal via a coupling capacitor, and a gate and a drain of the transistor are connected to a second power source so that current flows between the source and the drain while a constant voltage is applied to the input terminal. To output the current signal, the drain is disconnected from the second power source, the voltage signal is supplied from the input terminal to the holding capacitor via the coupling capacitor, the coupling capacitor is disconnected from the input terminal, the gate is disconnected from the second power source, the drain is connected to the second power source, and the source is connected to an output terminal.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A current to voltage converter which includes a common gate transconductance element having at least one input and one output. The current to voltage converter further includes a common source transconductance element having at least one input and one output, where the common source transconductance element is connected to the common gate transconductance element. The current to voltage converter further includes a feedback circuit including a resistor, where the feedback circuit connects any input having a polarity to any output having an opposite polarity.

Abstract: A MOS integrated circuit includes: a voltage-to-current conversion circuit configured to convert first and second voltages to a first current having a current value corresponding to the first voltage and a second current having a current value corresponding to the second voltage; and a current comparison circuit configured to compare the respective current values of the first and second currents and to output a voltage showing the comparison result. Oxide films of MOS transistors of the current comparison circuit are thinner than oxide films of MOS transistors of the voltage-to-current conversion circuit.

Abstract: 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.

Abstract: 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.

Abstract: A load driving apparatus is provided. The load driving apparatus is configured to output an electrical signal to a load. The load driving apparatus includes a driver and an average voltage/current detector. The driver receives an input voltage and a control signal. The driver tunes the electrical signal according to the control signal. The average voltage/current detector receives the electrical signal outputted to the load and generates the control signal by comparing the electrical signal and a reference signal.

Abstract: 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.

Abstract: 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.

Abstract: A monitoring and control circuit comprises a sense block, a first and a second comparators, and a control module. The current sense block is coupled to a switch for generating a monitoring signal indicative of a current flowing through the switch. The first comparator coupled to the sense block is operable for comparing the monitoring signal to a first threshold and for providing a first signal according to a first comparison result between the monitoring signal and the first threshold. The second comparator coupled to the sense block is operable for comparing the monitoring signal to a second threshold and for providing a second signal according to a second comparison result between the monitoring signal and the second threshold. The control module coupled to the first comparator and the second comparator provides a control signal for controlling the switch according to the first signal and the second signal so as to adjust the current.

Abstract: The current drive device of the present invention includes: a current source transistor for allowing a preset drive current to flow to a drain; a cascode transistor cascode-connected to the current source transistor; a switch circuit for switching ON/OFF flow of the drive current through the drain of the cascode transistor and a circuit to be driven; and a bypass circuit for allowing the drive current to flow therethrough to bypass the switch circuit and the circuit to be driven when the switch circuit is OFF.

Abstract: 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.

Abstract: 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.

Abstract: There is provided a reference voltage generating circuit generating a reference voltage to be applied to a current-to-voltage converting circuit in order to compensate for an offset voltage of the current-to-voltage converting circuit converting an input current into a voltage and outputting the voltage, the reference voltage generating circuit including: a sampling conversion circuit having the same circuit characteristics as the current-to-voltage converting circuit and adding a predetermined offset to the reference voltage to generate an output voltage; and a comparator controlling the reference voltage so that the output voltage of the sampling conversion circuit is equal to a predetermined voltage, wherein the reference voltage is applied as an input to the sampling conversion circuit.

Abstract: A common resistor is connected to load impedances that convert differential currents respectively generated by current sources into differential voltages. A constant current generated by the. current sources is supplied to the common resistor to cause the common resistor to generate an in-phase current and set a common potential.

Abstract: Adaptation circuits (3) for controlling conversion circuits (1-2) for converting input signals into pulse signals and for converting pulse signals into output signals are provided with generators (30) for generating control signals in dependence of input signals and (basic idea) with compensation circuits (71-72, 81-83) for adjusting the generators (30) in dependence of input information for increasing a stability of output signals, to be able to supply relatively constant output signals to loads (6). The adaptation circuits (3) may reduce dependencies between input signals and output signals and may generate control signals independently from output signals to avoid feedback loops.

Abstract: 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.

Abstract: A filter circuit includes a voltage-current conversion portion that converts a voltage signal input to an input terminal to a current signal, a first capacitor unit formed by a plurality of capacitors, and in which a current signal output from the voltage-current conversion portion is sequentially input to the capacitors, the unit adding and outputting electric charges of a group of capacitors to which the current signal is input, a second capacitor unit formed by a plurality of capacitors, and in which a current signal output from the first capacitor unit is sequentially input to the capacitors, the unit adding and outputting electric charges of a group of capacitors to which the current signal is input, and a plurality of connection nodes that respectively connect a given capacitor in the first capacitor unit and a capacitor in the second capacitor unit.

Abstract: A light receiving circuit in accordance with an exemplary aspect of the present invention includes a photodiode 6 that converts an optical input signal into a current signal, and an I-V conversion circuit 8 that converts the current signal into a voltage signal. The light receiving circuit further includes a transient current processing circuit 21 that process a transient current from the I-V conversion amplifier 8 when the I-V conversion amplifier 8 is changed from an operating state to a non-operating state, and a clipping circuit 24 that keeps the voltage of the input terminal of the transient current processing circuit 21 at a predetermined value.

Abstract: A signal-processing circuit has a first and a second input, which receive a first and a second differential signal, a third input, which receives a common-mode signal, the first and second differential signals having an equal and substantially opposite trend with respect to the common-mode signal, and a first output supplying a first processed signal, equivalent to the first differential signal rectified with respect to the common-mode signal, and satisfying throughout its course a first relation of comparison with the common-mode signal. The processing circuit is provided with first formation means for formation of the first processed signal, which operate on the basis of the first differential signal, and second formation means for formation of the first processed signal, which operate on the basis of the second differential signal; the first and second formation means co-operate in the formation of the first processed signal.

Abstract: The present invention provides an oscillator and a communication system using the oscillator, in particular, an LC oscillator adapted to lessen phase noise deterioration due to harmonic distortions and increase the amplitude of oscillation, thereby having a favorable low phase noise characteristic. The oscillator comprises at least one voltage to current converter consisting of a transistor and a resonator comprising two LC tanks consisting of a pair of conductive elements and inductive elements. A feedback loop is formed such that an output terminal of the voltage to current converter is connected to the resonator and a current input to the resonator is converted to a voltage which is in turn fed back to an input terminal of the voltage to current converter. Inductive elements constituting the two LC tanks constituting the resonator are mutually inductively couple and a coefficient of the mutual induction is about ?0.6.

Abstract: System and method for processing analog voltage for cold-cathode fluorescent lamp. The system includes a voltage-to-current converter configured to receive an input analog voltage signal and generate a first current signal, and a current processing component configured to receive the first current signal and a predetermined current and generate a second current signal. Additionally, the system includes a current-to-voltage converter configured to receive the second current signal and generate an output analog voltage signal, and a dimming controller configured to receive the output analog voltage signal and generate a control signal for driving at least a cold-cathode fluorescent lamp. The voltage-to-current converter, the current processing component, and the current-to-voltage converter are configured to be biased between a first power supply voltage level and a second power supply voltage level.