Negative Feedback
- Negative feedback of an op-amp is defined as:
The process of taking some, or all, of its output and adding it to the input and is out of phase with the input
- This is to produce self-stabilising systems
- To make the feedback negative, it is fed to the negative (inverting input) terminal of an op-amp
- The effect produced a closed-loop circuit results in ‘closed-loop’ gain
- The effects of negative feedback on the gain on an op-amp are:
- Reduced gain
- Increased bandwidth or less distortion
- Increase operating stability
- If some of the output voltage is fed back to the inverting input (V−) then gain A can be altered to a lower value