Buffer amplifier

Electronic amplifier, a circuit component

In electronics, a buffer amplifier is a unity gain amplifier that copies a signal from one circuit to another while transforming its electrical impedance to provide a more ideal source. This "buffers" the signal source in the first circuit against being affected by currents from the electrical load of the second circuit and may simply be called a buffer or follower when context is clear.

This keyword could refer to multiple things. Here are some suggestions: