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- Homework Statement
- An amplifier has a voltage gain Av = 1000 , input impedance 1 kΩ and output impedance 500Ω A

fraction βv = 0.1 of the output voltage is fed back in the series in opposition to the input voltage. The

input and output impedance after the feedback are given respectively by the approximate values ?

- Relevant Equations
- A' = A/(1-βA)

I know that when the feedback is connected, the voltage gain changes by the above formula. But I don't know how to find final values of input and output impedances.