Question 8.12: The input and output voltages of an amplifier are 2 mV and 2...

Z_{in} = 5 KΩ
Z_{0}= 100 Ω
A_{f} = 100

We know,

Substituting values,

or,                                1+1,000 β= 10

or,                                β=\frac{9}{1,000}=0.009

Z_{in} with feedback = (1+βA) Z_{in} = (1+0.009 ×1,000) ×5 KΩ
= 50 KΩ

Z_{0} with feedback =\frac{Z_{0} }{1+βA}=\frac{100}{(1+0.09 ×1,000)}=10  Ω.