<P> A negative - feedback amplifier (or feedback amplifier) is an electronic amplifier that subtracts a fraction of its output from its input, so that negative feedback opposes the original signal . The applied negative feedback can improve its performance (gain stability, linearity, frequency response, step response) and reduces sensitivity to parameter variations due to manufacturing or environment . Because of these advantages, many amplifiers and control systems use negative feedback . </P> <P> An idealized negative - feedback amplifier as shown in the diagram is a system of three elements (see Figure 1): </P>

Advantages of introducing negative feedback in an amplifier circuit