Nonlinear class AB input stage
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United States of America Patent
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Feb 21, 2017
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N/A
app pub date -
Feb 11, 2015
filing date -
Feb 12, 2014
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Abstract
A circuit includes a differential input stage amplifier that receives a differential input voltage and generates an output voltage based on a difference in the differential input voltage. A feedback loop provides feedback from an output of the differential input stage amplifier to input tail current of the differential input stage amplifier. The feedback loop enables class AB operation of the differential input stage amplifier. At least one gain reducer is operatively coupled to the feedback loop to reduce the gain of the feedback loop. The gain reducer has a resistance value that varies inversely proportional to loop current in the feedback loop to reduce the gain of the feedback loop as loop current increases.
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