Topic: Electronic Devices and Circuits
Pinch-off voltage in an FET is:
- A. The gate-to-source voltage that gives zero drain current
- B. The drain voltage that gives zero drain current
- C. The gate source voltage that gives unity drain current
- D. The drain voltage that gives infinite drain current
Answer: A. The gate-to-source voltage that gives zero drain current
Explanation: The pinch-off voltage ($V_p$ or $V_{GS(off)}$) in a Field Effect Transistor (FET), particularly a JFET, is defined as the reverse-bias gate-to-source voltage at which the depletion regions from opposite sides of the channel completely merge, cutting off the conductive path. This effectively reduces the drain current to zero.