Question

Which among the following is also used as a buffer or an isolation amplifier?
A. Inverting amplifier
B. Non-inverting amplifier
C. Unity Follower
D. Emitter Follower

Answer 1

Any follower circuit, which is useful for impedance conversion because of low output impedance. Isolation amplifiers are used to allow measurement of small signals in the presence of a high common mode voltage.

Complete answer:
The Unity Follower circuit can be used for buffering or as an isolation amplifier since it can achieve a gain of one despite the need for phase reversal.A unity gain amplifier, a voltage buffer, or an isolation amplifier are all terms used to describe a voltage follower. The output voltage of a voltage follower circuit is identical to the input voltage; as a result, it has a gain of one (unity) and does not enhance the incoming signal. There are no external components required for the voltage follower.

A voltage follower (also known as a unity-gain amplifier, a buffer amplifier, or an isolation amplifier) is a one-voltage-gain op-amp circuit.This indicates that the op amp does not deliver any signal amplification. The output voltage follows the input voltage directly, meaning the output voltage is the same as the input voltage. This is why it's called a voltage follower. As an example, if 10V is fed into the op amp as an input, 10V is output. A voltage follower serves as a buffer, with no signal amplification or attenuation.

Hence, the correct option is C.

Note: On buses, tri-state voltage buffers are commonly utilised to allow several devices to communicate with one another. Because a bus can only read one data input from a device at a time, a tri-state buffer is used. With its control input, a tri-state buffer can prevent a bus from reading too much data.