OPERATIONAL AMPLIFIER AND CONTROL METHOD THEREFOR

OPERATIONAL AMPLIFIER AND CONTROL METHOD THEREFOR

An operational amplifier is characterized by: a first amplifier stage, configured to generate first output voltages according to first input voltages; a second amplifier stage, configured to generate second output voltages according to the first output voltages; a second output stage circuit, config...

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Hauptverfasser: WANG, Wen-Chi, NG, Si Herng
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Sprache:eng ; fre ; ger
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AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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creator WANG, Wen-Chi
NG, Si Herng
description An operational amplifier is characterized by: a first amplifier stage, configured to generate first output voltages according to first input voltages; a second amplifier stage, configured to generate second output voltages according to the first output voltages; a second output stage circuit, configured to replicate an equivalent or a scaled-down version of the first output stage circuit; a first common-mode feedback circuit, configured to keep an output common-mode voltage of the second output stage circuit at a predetermined value; a logic loop circuit configured to, when the operational amplifier operates in a direct current calibration phase, adjust a difference between the first output voltages; a bias circuit, configured to generate a voltage close to a common-mode voltage of the first output voltages produced after the operational amplifier is turned on, the voltage serving as a reference voltage of a second common-mode feedback circuit.
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subjects AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
title OPERATIONAL AMPLIFIER AND CONTROL METHOD THEREFOR
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