Op Amp Negative Feedback

Op Amp Negative Feedback

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.

Advantages

  • Improves stability and frequency response
  • Lowers output impedance
  • Minimises noise and distortion

Disadvantages

  • Decreases amplification by reducing gain