SOLUTION

A special case of a non-inverting amplifier in which all of the output voltage is fed back to the inverting input of the op-amp is called voltage follower.

Detailed Solution

• The Voltage follower circuit is a Non-Inverting Amplifier that has negative feedback.
• 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.
• The voltage follower is used as a buffer amplifier, isolation amplifier, unity gain amplifier as the output follows the input.
• The voltage follower provides no alternation or amplification but only buffering.
• The Op-amp circuit does not provide any amplification thus, its voltage gain is unity.