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Analog Electronics

Q1: An amplifier has open loop gain of 100, input impedance 1 kΩ and output impedance 100 Ω. If negative feedback with β = 0.99 is used, the new input and output impedances are

A 10 Ω and 1 Ω

B 10 Ω and 10 kΩ

C 100 kΩ and 1 Ω

D 100 kΩ and 10 Ω

ANS:C - 100 kΩ and 1 Ω

Input impedance with feedback = (1 kΩ) (1 + 100 + 0.99) = 100 kΩ. Output impedance with feedback = .



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