An amplifier has input impedance of 4 kΩ and output impedance of 80 – McqOptions

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1.	An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are
A.	40 kΩ and 8 kΩ respectively
B.	4 kΩ and 80 kΩ respectively
C.	0.4 kΩ and 800 kΩ respectively
D.	8 kΩ and 160 kΩ respectively
Answer» B. 4 kΩ and 80 kΩ respectively

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