| 摘要 |
There is provided an amplifier circuit having a common-source amplifier, an output load connected to an output terminal of the common-source amplifier, a buffer circuit connected to the output terminal of the common-source amplifier, a feedback circuit connected between an output terminal of the buffer circuit and an input terminal of the common-source amplifier, and a control circuit for controlling an impedance of the feedback circuit in accordance with a gain of the common-source amplifier.
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