Editing Common gate (section)

{{Short description|Electronic amplifier circuit type}}
{{More footnotes|date=April 2009}}
[[File:Common Gate.svg|thumbnail|200px| Figure 1: Basic N-channel common-gate circuit (neglecting [[biasing]] details); current source ''I<sub>D</sub>'' represents an [[active load]]; signal is applied at node ''V<sub>in</sub>'' and output is taken from node ''V<sub>out</sub>''; output can be current or voltage]]

In [[electronics]], a '''common-gate''' [[electronic amplifier|amplifier]] is one of three basic single-stage [[field-effect transistor]] (FET) amplifier topologies, typically used as a [[Electric current|current]] [[buffer amplifier|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 some DC biasing voltage (i.e. an AC ground), or "common," hence its name.
The analogous [[bipolar junction transistor]] circuit is the [[common base|common-base amplifier]].