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GATE 2020 EE – Question 24

Analog and Digital Electronics · Amplifiers: biasing, equivalent circuit and frequency response · 1 mark · Multiple choice

A common-source amplifier with a drain resistance, $R_D=4.7\ \text{k}\Omega$, is powered using a 10 V power supply. Assuming that the transconductance, $g_m$, is $520\ \mu$A/V, the voltage gain of the amplifier is closest to:

  1. $-2.44$
  2. $-1.22$
  3. $1.22$
  4. $2.44$

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Correct answer: (A) $-2.44$

Explanation

The gain of a common-source amplifier is $-g_mR_D=-520\times10^{-6}\times4700=-2.44$.