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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 [Correct Answer] |
B. | 4 kΩ and 80 kΩ respectively [Wrong Answer] |
C. | 0.4 kΩ and 800 kΩ respectively [Wrong Answer] |
D. | 8 kΩ and 160 kΩ respectively [Wrong Answer] |