Amplifier, fully-differential amplifier and delta-sigma modulator
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United States of America Patent
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Oct 6, 2015
Grant Date -
Jun 25, 2015
app pub date -
Mar 10, 2015
filing date -
Aug 26, 2011
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Abstract
An amplifier includes a front-end gain stage and an AC-coupled push-pull output stage. The AC-coupled push-pull output stage includes a first transistor, having a source, a drain and a gate, wherein the source of the first transistor is coupled to a first voltage level. The AC-coupled push-pull output stage further includes a second transistor, having a source, a drain and a gate, wherein the source of the second transistor is coupled to a second voltage level, the gate of the second transistor is coupled to the front-end gain stage, and the drain of the second transistor is coupled to the drain of the first transistor to form an output terminal of the amplifier. Further, the AC-coupled push-pull output stage includes an AC-coupled capacitor, which is a passive two terminal electrical component coupled between the front-end gain stage and the gate of the first transistor.
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