The input impedance of a JFET is high because __---

Q. The input impedance of a JFET is high because __—

A

Its gate is insulated from the channel

B

Its input is reverse biased

C

Of the presence of the substrate

D

All the above

Solution:

JFET or Junction Field Effect Transistor is one of the simplest types of field-effect transistor.
JFETs are voltage-controlled devices.
In JFET, the current flow is due to the majority of charge carriers.
By applying a reverse bias voltage to a gate terminal, the channel is “pinched”, so that the electric current is impeded or switched off completely. Thus input impedance becomes high.

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