Marvell International Limited

Marvellworld Trade Ltd.

Yongxu Wang

Xiaoxiao Zhao

Wenrong Qian

Yifeng Huang

Yonghua Song

Kapil Jain

Tao Shui

Hao Zhou

Song Chen

Haiqing Zhang

Aspects of the disclosure provide a regulator circuit including an output circuit, an error detection circuit and an intermediate circuit. The output circuit is configured to receive a first supply voltage, output and regulate a second supply voltage based on a control signal. The error detection circuit is responsive to the first supply voltage, and is configured to compare the second supply voltage with a reference voltage, and generate an error signal with a voltage level that is indicative of a difference between the second supply voltage and the reference voltage. The intermediate circuit is configured to generate a first electrical current based on the error signal and a second electrical current based on the second supply voltage, combine the first electrical current and the second electrical current to generate a third electrical current, and generate the control signal at least partially based on the third electrical current.

Voltage regulator

Aspects of the disclosure provide a circuit for providing a power supply. The circuit includes a control signal generator circuit and a switch network circuit. The control signal generator circuit is configured to generate a control signal with a voltage level that is a function of an output voltage on a load capacitor. The switch network circuit is coupled with the load capacitor and a flying capacitor to form a charge pump circuit. The switch network circuit is configured to charge the flying capacitor in a charge stage and pump the flying capacitor in a pump stage to generate the output voltage on the load capacitor. The switch network circuit is configured to provide a pump control voltage to the flying capacitor during the pump stage. The pump control voltage has a voltage level that is adjusted based on the control signal to maintain the output voltage to be stable.

Regulated charge pump circuit

Aspects of the disclosure provide an amplification circuit. The amplification circuit includes an amplifier and a first variable resistive device. The amplifier includes first and second input nodes configured to receive the first and second input electrical signals and first and second output nodes configured to output first and second output electrical signals having amplified voltages relative to the first and second input electrical signals. The first variable resistive device is electrically coupled to the second input node of the amplifier. The first variable resistive device being configured to have a selected resistance value to compensate for a direct current (DC) voltage difference between the first and second input electrical signals based on a DC voltage difference between first and second output electrical signals that are output from the first and second output nodes of the amplifier.

Amplification circuit and method of compensating for voltage offset of inputs

Aspects of the disclosure process an amplifier circuit. The amplifier circuit includes an input stage, an intermediate stage, an output stage and a detecting and controlling circuit. The input stage is configured to receive an electrical signal for amplification. The intermediate stage is configured to amplify with an adjustable gain. The output stage is configured to drive an audio output device in response to the amplified electrical signal. The detecting and controlling circuit is configured to detect a current for driving the audio output device, and adjust the gain of the intermediate stage based on the current to compensate for a pole change of the amplifier circuit due to a change of the current.

Headphone amplifier

Growing community of inventors

Shanghai, China

Yongxu Wang