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Analog Electronics - Engineering

Q1:

In a shunt-shunt negative feedback amplifier, as compared to the basic amplifier

A both input and output impedances, decrease

B input impedance decreases but output impedance increase

C I/P impedance increases but O/P impedance decreases

D both input and O/P impedance increases

ANS:B - input impedance decreases but output impedance increase

It should be A.

For voltage-shunt feedback, Zif=Zi/1+BA and Zof=Zo/1+BA.