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GATE 2014 EC (EC3) – Question 21

Analog Circuits · BJT and MOSFET Amplifiers · 1 mark · Multiple choice

A transconductance amplifier should have ______.

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

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Correct answer: (A) high input and high output resistance

Explanation

A transconductance amplifier accepts an input voltage and produces output current. High input resistance avoids loading the voltage source; high output resistance makes output current insensitive to load voltage. Therefore **high input and high output resistance,A** is desirable.