Abstract: A voltage conversion device has a non-linear gain, for converting analog voltage provided by an analog voltage source. The voltage conversion device comprises a gain decision module, a voltage selection module, and a voltage output module. The gain decision module comprises an analog to digital (A/D) converter and a gain selector. The A/D converter is used for converting analog voltage provided by the analog voltage source into digital signals. The gain selector is used for determining a gain. The voltage selection module is used for outputting a direct-current (DC) voltage. The voltage output module has a first input end coupled to the gain selector, an output end coupled to the gain selector, and a second input end coupled to the voltage selection module, for outputting an amplified result of the DC voltage outputted from the voltage selection module.

Abstract: An LED illuminant driving circuit and an automatic brightness compensation method thereof are provided herein. The automatic brightness compensation method includes: providing a target value; detecting an operation period of a pulse of an output of the LED illuminant driving circuit, the pulse is adapted to an LED illuminant for making the light emitting; deciding a peak value according to the target value and the operation period; and setting a peak level of the pulse according to the peak value. The LED illuminant driving circuit and the automatic brightness compensation method thereof provides a stable average current/voltage to the LED illuminant and avoids brightness variations of the light emitting.

Abstract: A charge pump circuit is provided. The charge pump circuit includes a pump unit, first through sixth switches, a fly capacitor and an output capacitor. In a first period, an input voltage and a first voltage charge at least one internal capacitor of the pump unit via a first terminal and a second terminal of the pump unit. In the second period, the internal capacitor of the pump unit provides charges to the fly capacitor via the second switch and generates a first output voltage. In the third period, the fly capacitor supplies the charges to the output capacitor via the fourth switch to generate a second output voltage.

Abstract: A power conversion system and a power conversion method thereof. The power conversion system includes a driving unit, a control unit, a first direct current (DC) power supply circuit and a second DC power supply circuit. The control unit controls the driving unit to drive a load. The first DC power supply circuit converts an alternating current (AC) power into a first DC power outputted to the driving unit, and the second DC power supply circuit converts the AC power into a second DC power outputted to the control unit.

Abstract: A light adjusting device for a light emitting diode includes a switch, a detecting unit and an illumination adjusting unit. The switch is coupled to a power terminal, which is utilized for providing power for the light emitting diode. The detecting unit is coupled to the switch, and is utilized for determining a status of the switch, so as to generate a detecting result. The illumination adjusting unit is coupled to the detecting unit, and is utilized for adjusting illumination of the light emitting diode according to the detecting result.

Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.

Abstract: A method and an apparatus for stabilizing output from a Phase Lock Loop (PLL) and the PLL thereof is disclosed. The method mainly relates to enabling the control voltage of a voltage control oscillator VCO in the PLL remained unchanged by means of turning off a charge-discharge current source of a charge pump in a PLL in response to a detected reference signal lower than a default value. Furthermore, the method enables the pulse frequency output from the VCO no exceeding a default tolerant frequency range in a distance from a desired output frequency. Thus, when the reference signal resumes the original frequency, the PLL can quickly lock the phase and the frequency again.

Abstract: A voltage regulator and a voltage regulating method thereof and a voltage generator using the voltage regulator are disclosed by the present invention. The voltage regulator of the present invention uses a first switching unit and a second switching unit to respectively provide an operational transconductance amplifier (OTA) with different closed-loop feedback paths during a first period and a second period. In this way, an auto-zeroing unit is able to exactly store an input offset voltage presented between the inverting input terminal and the non-inverting input terminal of the OTA.

Abstract: A charge pump circuit is provided. The charge pump circuit includes a pump unit, first through sixth switches, a fly capacitor and an output capacitor. In a first period, an input voltage and a first voltage charge at least one internal capacitor of the pump unit via a first terminal and a second terminal of the pump unit. In the second period, the internal capacitor of the pump unit provides charges to the fly capacitor via the second switch and generates a first output voltage. In the third period, the fly capacitor supplies the charges to the output capacitor via the fourth switch to generate a second output voltage.

Abstract: A voltage regulator including a voltage regulation unit and an over driving unit is provided. The voltage regulation unit outputs a corresponding output voltage according to an input voltage. The over driving unit is coupled between an input terminal and an output terminal of the voltage regulation unit and regulates the input voltage according to the comparison result between the output voltage and a reference voltage.

Abstract: A sample-and-hold apparatus and an operating method thereof are provided. The sample-and-hold apparatus includes a sampling amplifier, a transistor, a first switch, a second switch, a sampling capacitor, and a drain-charge unit. A first input terminal of the sampling amplifier receives an input signal. A first-terminal of the transistor is coupled to a first voltage. The first switch is coupled between an output terminal of the sampling amplifier and a gate of the transistor. The first and second terminals of the second switch are coupled to a second terminal of the transistor and a second input terminal of the sampling amplifier, respectively. The first and second terminals of the sampling capacitor are coupled to the gate of the transistor and a reference voltage. The drain-charge unit for draining/providing charges has first and second terminals coupled to the second terminal of the second switch and a second voltage, respectively.

Abstract: An amplifier device capable of reducing offset voltage includes an offset-voltage cancellation device, an input stage circuit, an output stage circuit, a pseudo output stage circuit, a switch circuit, and an output end. The switch circuit is coupled to the input stage circuit, the output stage circuit, and the pseudo output stage circuit, and is utilized for transmitting an amplified signal provided by the input stage circuit to the output stage circuit and transmitting a first feedback voltage provided by the output stage circuit to the input stage circuit or transmitting the amplified signal provided by the input stage circuit to the pseudo output stage circuit and transmitting a second feedback voltage provided by the pseudo output stage circuit to the input stage circuit according to an operating mode.

Abstract: A voltage buffer and the source driver thereof are disclosed. The above-mentioned voltage buffer includes an operational amplifier and an overdriving unit, wherein the operational amplifier outputs an output voltage. The overdriving unit is coupled between an input voltage and the operational amplifier for comparing the input voltage with the output voltage and outputting an overdriving voltage to the positive input terminal of the operational amplifier. Herein if the input voltage is greater than the output voltage, the overdriving voltage is greater than the input voltage; if the input voltage is less than the output voltage, the overdriving voltage is less than the input voltage; if the input voltage is equal to the output voltage, the overdriving voltage is equal to the input voltage.

Abstract: A charge pump circuit including a plurality of switches and a switch control circuit is provided. The charge pump circuit is suitable for a display panel. The switches switch from “off” state to “on” state in an enable transition, and switch from “on” state to “off” state in a disable transition. The switch control circuit is coupled to the switches for controlling the on/off states of the switches and allowing the charge pump circuit to provide an output voltage that is different from an input voltage. The switch control circuit prolongs the time required for enable transition of the switches to be longer than the time for disable transition thereof. The equivalent impedances of the switches change from high values to low values when the switches are at the enable transition.

Abstract: A current source apparatus for reducing interference with noise is provided. The current source apparatus includes a controllable current source and a feedback controller. The controllable current source provides an output current according to a control signal and produces a feedback signal according to the output of the controllable current source. The feedback controller is coupled to the controllable current source for receiving the feedback signal, and the feedback controller adjusts the control signal based on the feedback signal and outputs the control signal for controlling the controllable current source to output a stable output current.

Abstract: A charge pump control circuit and a control method for controlling charge pumps are disclosed. The output terminal of the charge pump is coupled to a load circuit. The charge pump control circuit includes a detecting and controlling circuit and a controlled oscillator. The detecting and controlling circuit is used to detect the load status of the load circuit and output a control signal according to the load status. The controlled oscillator receives the control signal and outputs at least one clock signal. According to the control signal to control a frequency of the clock signal, the charge pump control circuit controls the charge pump.

Abstract: A dynamic biasing amplifier apparatus, and dynamic biasing apparatus, and method are disclosed. The dynamic biasing amplifier apparatus includes a comparator unit, a dynamic bias generator unit, and an amplifier unit. The amplifier unit receives an input signal and output an output signal based on at least a bias voltage. The comparator unit compares the positive and negative input signals of the amplifier unit. The dynamic bias generator unit generates and adjusts the bias voltage in accordance with the comparing result of the comparator unit. Therefore, the dynamic bias generator unit controls the amplifier unit to operate in a low static current mode when the input signal is in steady state; and the dynamic bias generator unit controls the amplifier unit to operate in a high dynamic current mode when the input signal is in transition state.

Abstract: A voltage regulator and a voltage regulating method thereof and a voltage generator using the voltage regulator are disclosed by the present invention. The voltage regulator of the present invention uses a first switching unit and a second switching unit to respectively provide an operational transconductance amplifier (OTA) with different closed-loop feedback paths during a first period and a second period. In this way, an auto-zeroing unit is able to exactly store an input offset voltage presented between the inverting input terminal and the non-inverting input terminal of the OTA.

Abstract: A high accuracy sample and hold circuit including a first switch, a second switch, a first capacitor, a second capacitor and an amplifier is disclosed. The first capacitor receives and saves a sampling voltage from the first switch during a first period, while the second capacitor receives and saves another sampling voltage from the second switch during a second period. The amplifier has first and second positive input terminals, a negative input terminal, an output terminal and a first input stage and an output stage. Wherein, the first input stage includes a first input set and a second input set. During the first period, the amplifier disables the operation of the first input set and enables the operation of the second input set, while during the second period, the amplifier enables the operation of the first input set and disables the operation of the second input set.

Abstract: A voltage conversion device capable of enhancing conversion efficiency includes a charge pump for generating output voltage linear to input voltage according to the input voltage, a feedback unit for generating a feedback signal according to the output voltage generated by the charge pump, and a regulating unit for outputting and adjusting the input voltage according to the feedback signal provided by the feedback unit, so as to keep the output voltage unchanged.