A voltage follower, also known as a unity gain buffer, is a basic electronic circuit designed to isolate and replicate the input voltage signal without amplification. Its primary purpose is to provide high input impedance and low output impedance, effectively preventing any significant load on the input while delivering a signal with minimal distortion or alteration. The voltage follower is often used to interface between circuits with different impedance levels or to isolate sensitive input stages from the effects of loading.
The operation of a voltage follower circuit is relatively simple and involves just