The GATE Grind

GATE 2018 EC – Question 13

Analog Circuits · Op-amp Circuits · 1 mark · Multiple choice

A good transimpedance amplifier has

  1. low input impedance and high output impedance.
  2. high input impedance and high output impedance.
  3. high input impedance and low output impedance.
  4. low input impedance and low output impedance.

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Show answer and explanation

Correct answer: (D) low input impedance and low output impedance.

Explanation

A transimpedance amplifier converts an input current into an output voltage, so it should have a low input impedance (to accept a current source) and a low output impedance (to act as a good voltage source).