1. What are the four possible topologies of a feedback amplifier? Explain with neat sketches?
List five characteristics of an amplifier which are modified by negative feedback. Explain them in
brief?
Draw and explain the circuit of a current – series feedback amplifier?
What is the effect of negative feedback on gain and bandwidth of an amplifier?
Draw the block diagram of a negative feedback amplifier. Derive an expression for the voltage gain of
an amplifier of gain A when subjected to negative feedback with a feedback fraction B?
State the merits and demerits of negative feedback amplifier?
Discuss the effect of negative feedback on:
i. Distortion
ii. Output impedance
iii. Input impedance
An amplifier with current feedback has the following specifications :
hfe = 100Ω, hie = 2000 Ω, R1 = 15000 Ω, R2 = 5600 Ω, Re = 100 Ω and RL = 470 Ω
Calculate the values of voltage gain and input resistance of the amplifier with and without
feedback?
Calculate the voltage gain, input and output resistances of a voltage series feedback amplifier
having Av = 300, Ri = 1.5 kΩ, Ro = 50 kΩ and β = 1/15.
