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Figure 1: Basic N-channel JFET common-source circuit (neglecting biasing details). Figure 2: Basic N-channel JFET common-source circuit with source degeneration. In electronics, a common-source amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage or transconductance amplifier.
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Download QR code; In other projects Appearance. move to sidebar hide File; File history ... Symbol for an N-Channel JFET with label (S,D,G) G = Gate D = Drain S = Source.
To switch off an n-channel device requires a negative gate–source voltage (V GS). Conversely, to switch off a p-channel device requires positive V GS. In normal operation, the electric field developed by the gate blocks source–drain conduction to some extent. Some JFET devices are symmetrical with respect to the source and drain.
The mode can be determined by the sign of the threshold voltage (gate voltage relative to source voltage at the point where an inversion layer just forms in the channel): for an N-type FET, enhancement-mode devices have positive thresholds, and depletion-mode devices have negative thresholds; for a P-type FET, enhancement-mode have negative ...