in junction field-effect transistors (JFETs), "pinch-off" refers to the threshold voltage below which the transistor turns off. the pinch off voltage is the value of Vds when drain current reaches constant saturation value.

What is pinch off voltage in mosfets?

Pinch off voltage is defined as the gate-to-source voltage at which drain-to-source current is zero.

What is mean by pinch off?

phrasal verb. pinch something off/out. ​to remove something by pressing your thumb and fingers together and pulling. Pinch off the dead flowers.