What type of output does a BUFFER amplifier have when there is no inversion of the input signal?

A BUFFER amplifier is designed to provide a specific function in electronic circuits, primarily acting as an impedance matching device. When we say that a BUFFER amplifier has no inversion of the input signal, it means that the output signal is a direct reproduction of the input signal without any phase change.

The defining trait of a BUFFER amplifier is its ability to achieve unity gain, which means that the output voltage is the same as the input voltage. This is incredibly useful in applications where you want to isolate different stages of a circuit without altering the signal's amplitude or phase. Unity gain signifies that the amplification factor is equal to one, ensuring that the input and output voltages are equal.

In summary, since the BUFFER amplifier outputs the input signal directly and faithfully without any change in amplitude or phase, it exhibits unity gain output, making it the correct choice in this context.