Negative feedback is the process of returning a portion of the output signal back to the input, and in operational amplifiers, a feedback resistor transfers some of the output signal back to the input. Negative refers to the phase of the output signal being 180° out of phase with the input signal. This type of feedback utilises the inverting input for reintroduction of the signal.
- Improves stability and frequency response
- Lowers output impedance
- Minimises noise and distortion
- Decreases amplification by reducing gain