Question:
A properly biased JFET will act as a:
A properly biased JFET will act as a:
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JFET = Voltage-in, Current-out. Always think of JFETs as voltage-controlled current sources in analog circuits.
Updated On: Jun 24, 2025
- Current controlled current source
- Voltage controlled voltage source
- Voltage controlled current source
- Current controlled voltage source
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The Correct Option is C
Solution and Explanation
A Junction Field Effect Transistor (JFET) operates as a voltage-controlled current source.
Its drain current ($I_D$) is controlled by the reverse bias voltage applied between the gate and source ($V_{GS}$).
Since the input (gate) draws negligible current, the output current is controlled purely by the input voltage, not input current.
Thus, JFETs are known for their high input impedance and are ideal as voltage-controlled current sources.
Its drain current ($I_D$) is controlled by the reverse bias voltage applied between the gate and source ($V_{GS}$).
Since the input (gate) draws negligible current, the output current is controlled purely by the input voltage, not input current.
Thus, JFETs are known for their high input impedance and are ideal as voltage-controlled current sources.
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