Q1Analog Electronics

A voltage follower is an Op-Amp circuit where the output is directly connected to the inverting (−) input, and the non-inverting (+) input receives the signal. Due to virtual short concept, $V_{out}=V_{in}$, giving a voltage gain of exactly +1. Its purpose is impedance matching — providing a very high input impedance and very low output impedance without any signal gain.

Slew Rate (SR) is defined as the maximum rate of change of output voltage that an Op-Amp can produce, regardless of how fast the input changes. It is given by:

A typical 741 Op-Amp has $SR=0.5$ V/μs. If the output is required to change faster than the SR allows, distortion results. SR limits the maximum frequency for full-amplitude sinusoidal output: $f_{max}=\frac{SR}{2\pi V_m}$.