Frequency compensation techniques for low-power and small-area multistage amplifiers
AssigneeUniversity of Macau
InventorsZushu YAN, Pui-In MAK, Man-Kay LAW, Rui Paulo da Silva MARTINS
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Abstract
A three stage amplifier is provided and the three stage amplifier comprises a first gain stage, a second gain stage and a third gain stage wherein said first stage receives an amplifier input signal and said third gain stage outputs an amplifier output signal. The amplifier includes a feedback loop having a current buffer and a compensation capacitance provided from the output of said third gain stage to the output of the first gain stage. In addition, an active left half plane zero stage is embedded in said feedback loop for cancelling a parasitic pole of said feedback loop.
Claims17
A Three stage amplifier comprising:
- first, second and third gain stages wherein said first stage receives an amplifier input signal and said third gain stage outputs an amplifier output signal;
- a feedback loop having a current buffer and a compensation capacitance provided from the output of said third gain stage to the output of the first gain stage;
- and an active left half plane zero stage embedded in said feedback loop for cancelling a parasitic pole of said feedback loop.
An amplifier as claimed 1 where said active left half plane zero stage is embedded inside the second stage.
An amplifier as claimed 1 where said active left half plane zero stage is embedded inside the output stage.
A three stage amplifier comprising:
- first, second and third gain stages wherein said first gain stage receives an amplifier input signal and said third gain stage outputs an amplifier output signal;
- a feedback loop having a current buffer and a compensation capacitance provided from the output of said third gain stage to the output of the first gain stage;
- and an active left half plane zero stage embedded in said feedback loop for cancelling a parasitic pole of said feedback loop comprising two gain stages, one gain stage including a feedback loop including a resistance and a second compensation capacitance.
A three stage amplifier comprising:
- first, second and third gain stages wherein said first gain stage receives an amplifier input signal and said third gain stage outputs an amplifier output signal;
- a feedback loop having a current buffer and a compensation capacitance provided from the output of said third gain stage to the output of the first gain stage;
- a feedforward transconductance stage extending from the output of said first gain stage to the output of said third gain stage;
- and an active left half plane zero stage embedded in the feedback loop for cancelling a parasitic pole of said feedback loop.
A three stage amplifier comprising:
- first, second and third gain stages wherein said first gain stage receives an amplifier input signal and said third gain stage outputs an amplifier output signal;
- a feedback loop having a current buffer and a compensation capacitance provided from the output of said third gain stage to the output of the first gain stage;
- and an active left half plane zero stage embedded in the second stage for cancelling a parasitic pole of said feedback loop.
A three stage amplifier comprising:
- first, second and third gain stages wherein said first gain stage receives an amplifier input signal and said third gain stage outputs an amplifier output signal;
- a feedback loop having a current buffer and a compensation capacitance provided from the output of said third gain stage to the output of the first gain stage;
- and an active left half plane zero stage embedded in the output stage for cancelling a parasitic pole of said feedback loop.
Dependencies are inferred from the claim text.