Discussion :: Analog Electronics
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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
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A.
40 kΩ and 8 kΩ respectively
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B.
4 kΩ and 80 kΩ respectively
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C.
0.4 kΩ and 800 kΩ respectively
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D.
8 kΩ and 160 kΩ respectively
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Answer : Option A
Explanation :
Closed loop input impedance = 4 (1 + 0.1 x 90) = 40 kΩ,
Closed loop Output impedance = 
= 8 kΩ.
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