We have 4 negative feedback topologies;series-shunt, series-series, shunt-shunt, shunt-series. I'd like to know something where we use these topologies. What are advantages compared to their each other ?
Based on the requirements of the application, the different topologies of feedback amplifiers are used accordingly.
Operational Amplifier: an ideal one has an infinite input impedance (to avoid loading effect) and very low output impedance. A series shunt (or voltage series) feedback amplifier topology has a high input impedance and a low output impedance. A voltage shunt (shunt shunt) feedback amplifier topology has both low input and output impedances. A series series (current series) feedback amplifier topology offers a high input impedance as well as a high output impedance.