The following circuit is

F2 U.B  Madhu 17.06.20 D 9

This question was previously asked in
IPRC ISRO Technical Assistant Electronics 21 April 2018 Official Paper
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  1. differential amplifier
  2. inverting amplifier
  3. non-inverting amplifier
  4. voltage follower

Answer (Detailed Solution Below)

Option 4 : voltage follower
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Detailed Solution

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The following circuit is a voltage follower with Negative feedback. 

The gain of Non-Inverting Amplifier is given by:

\(A = 1 + \frac{{{R_f}}}{{{R_1}}}\)

For voltage follower, Rf is 0

Hence gain (A) = 1

A voltage follower is an op-amp circuit whose output voltage straight away follows the input voltage. i.e. output voltage equivalent to the input voltage.

26 June 1

Characteristic of voltage follower:

  • High input impedance
  • Low output impedance
  • The loading effect can be avoided
  • Opamp takes zero current from the input
  • Provides power Gain & current gain but voltage gain unity
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