The GATE Grind

GATE 2026 IN – Question 21

Analog Electronics · Diodes and transistor circuits · 1 mark · Multiple choice

A common gate amplifier represents a _____________.

  1. voltage controlled voltage source
  2. current controlled current source
  3. voltage controlled current source
  4. current controlled voltage source

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Show answer and explanation

Correct answer: (B) current controlled current source

Explanation

A common-gate stage has low input impedance at the source terminal and high output impedance at the drain. The input current controls the output current, with small-signal current gain approximately unity.

Thus its standard amplifier model is a **current-controlled current source (B)**.