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common gate
In electronics, a common-gate amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a current buffer or voltage amplifier. In this circuit the source terminal of the transistor serves as the input, the drain is the output and the gate is connected to ground, or "common," hence its name.
The analogous bipolar junction transistor circuit is the common-base amplifier.
==Applications==
This configuration is used less often than the common source or source follower. It is useful in, for example, CMOS RF receivers, especially when operating near the frequency limitations of the FETs; it is desirable because of the ease of impedance matching and potentially has lower noise. Gray and Meyer〔
〕 provide a general reference for this circuit.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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