What is unity gain amplifier also known as?

This question was previously asked in
RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. Voltage follower
  2. Comparator
  3. Single sided
  4. Differential

Answer (Detailed Solution Below)

Option 1 : Voltage follower
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Amplifier

An amplifier is an electronic device that increases the voltage, current, or power of a signal.

The voltage gain of the amplifier is given by:

\(A_v={V_o\over V_i}\)

where, Av = Voltage gain

Vo = Output voltage

Vi = Input voltage

Explanation

If the voltage gain of the amplifier is unity i.e. Av = 1, then

 \(1={V_o\over V_i}\)

\({V_o= V_i}\)

For unity gain, the output voltage is equal to the input voltage, hence unity gain amplifier is also known as the voltage follower circuit.

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