Operational Amplifier (op-amp) Negative Feedback – Part 2 of 5

Negative feedback (-ve fb) is just connecting the Vout back to V-(inverted input). This voltage can be returned to V- through a resistor, capacitor, just only wire or some complex circuit.

It also make use of the same open gain formula of Vout = Ao(V+ – V-). Since it is a -ve fb, V- will be function/part of Vout (fVout). Therefore formula becomes Vout = Ao(V+ – fVout).

There 2 types of -ve fb as shown below:

2 types of -ve fb — Voltage Feedback and Operational Feedback.