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JFET (Junction Field Effect Transistor)

JFET (Junction Field Effect Transistor). Unipolar device (one polarity of charge carrier). Voltage controlled (gate voltage controls drain current). High input impedance ( 10 9 -10 12 ). No minority carrier storage. Source and drain are interchangeable in most

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JFET (Junction Field Effect Transistor)

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  1. JFET (Junction Field Effect Transistor) • Unipolar device (one polarity of charge carrier) • Voltage controlled (gate voltage controls drain current) • High input impedance (109-1012 ) • No minority carrier storage • Source and drain are interchangeable in most low-frequency applications

  2. Drain Drain Drain Gate Gate Gate Source Source Source SYMBOLS p-channel JFET n-channel JFET n-channel JFET Offset-gate symbol

  3. Operation of a JFET Drain - N Gate P P + + - DC Voltage Source - N + Source

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