Question

When an input signal reduces the channel size, the process is called

• A. Enhancement
• B. Substrate connecting
• C. Gate charge
• D. Depletion

Hint:

FET Modes. Enhancement: Gate voltage increases channel conductivity. Depletion: Gate voltage decreases channel conductivity.

Answer 1

The Correct Option is D

In Field-Effect Transistors (FETs), the conductivity of the channel between the source and drain is controlled by the electric field created by the gate voltage
- Enhancement mode: Applying a gate voltage *increases* the conductivity of the channel (e
g
, by inducing charge carriers)
- Depletion mode: Applying a gate voltage *decreases* the conductivity of the channel (e
g
, by repelling charge carriers and narrowing the conductive region)
Therefore, when an input signal (typically the gate voltage) acts to reduce the channel size or conductivity, this mode of operation or process is referred to as depletion