You searched for: “voltage follower
voltage follower
1. An amplifier used after an oscillator or other critical stage to isolate it from the effects of load impedance variations in subsequent stages. Also known as buffer; buffer stage.
2. An analog device that is typically used for impedance matching and signal isolation; for example, a sound card typically uses buffer amps at most of its input and output ports.
3. An operational amplifier that has no feedback components but has a direct feedback connection from the output to the inverting input to give unity gain so the output voltage follows the non-inverting input voltage.

A voltage follower has a very high input impedance and a very low output impedance.

This entry is located in the following unit: volt + (page 5)