A buffer (voltage follower) uses an op-amp to provide high input impedance, low output impedance, and unity gain, effectively isolating stages without amplification.
The given circuit consists of two operational amplifiers:
The first op-amp is configured as a unity-gain buffer (voltage follower), which takes \( V_{{in}} \) and drives the second stage with the same voltage.
The second op-amp also appears to be configured as a voltage follower, maintaining the same voltage at \( V_{{out}} \).
In such a configuration, the purpose is to provide isolation and no voltage gain, maintaining \( V_{{out}} = V_{{in}} \). This is the key characteristic of a buffer.
