High-speed, multi-stage class ab amplifiers
AssigneeMarvell World Trade Ltd.
InventorSehat Sutardja
Life of this patent
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Abstract
A multi-stage Class AB amplifier system comprises a first Class AB amplifier circuit that receives an input signal. A bias circuit receives an output of the first Class AB amplifier circuit. A second Class AB amplifier circuit having an input that communicates with an output of the bias circuit and that generates an output signal. A common-mode feedback circuit generates a feedback signal to the first Class AB amplifier circuit based on the output signal.
Claims38
A multi-stage Class AB amplifier system, comprising:
- a first Class AB amplifier circuit that receives an input signal;
- a bias circuit that receives an output of said first Class AB amplifier circuit;
- a second Class AB amplifier circuit having an input that communicates with an output of said bias circuit and that generates an output signal;
- and
- a common-mode feedback circuit that generates a feedback signal to said first Class AB amplifier based on said output signal.
A multi-stage Class AB amplifier system, comprising:
- a first Class AB amplifier circuit that receives a differential input signal;
- first and second bias circuits that receive first and second differential outputs of said first Class AB amplifier circuit and that generate differential bias signals;
- M current mirror circuits arranged between said first Class AB amplifier circuit and said first and second bias circuits;
- a second Class AB amplifier circuit that receives said differential bias signals and that generates a differential output signal;
- and
- a common-mode feedback circuit that generates feedback signals based on said differential output signal.
A method for operating a multi-stage Class AB amplifier system, comprising:
- providing a first Class AB amplifier circuit that receives an input signal;
- receiving an output of said first Class AB amplifier using a bias circuit;
- providing a second Class AB amplifier circuit having an input that communicates with an output of said bias circuit and that generates an output signal;
- and
- generating a common-mode feedback signal based on said output signal;
- wherein the common-mode feedback signal is provided to the first Class AB amplifier circuit.
A method of operating a multi-stage Class AB amplifier system, comprising:
- providing a first Class AB amplifier circuit that receives a differential input signal;
- receiving first and second differential outputs of said first Class AB amplifier circuit and generating bias signals using first and second bias circuits;
- arranging M current mirror circuits between said first Class AB amplifier circuit and said first and second bias circuits;
- providing a second Class AB amplifier circuit that receives said bias signals and that generates a differential output signal;
- and
- generating common-mode feedback signals based on said differential output signal.
Dependencies are inferred from the claim text.