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Symbol for an N-Channel JFET with label (S,D,G) G = Gate D = Drain S = Source. Svenska: Schematisk symbol för en JFET (Junction Field Effect Transistor) N-kanal. Date:
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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.
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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In an n-channel "depletion-mode" device, a negative gate-to-source voltage causes a depletion region to expand in width and encroach on the channel from the sides, narrowing the channel. If the active region expands to completely close the channel, the resistance of the channel from source to drain becomes large, and the FET is effectively ...