Electronics and Communication Engineering - Analog Electronics - Discussion
Discussion Forum : Analog Electronics - Section 6 (Q.No. 4)
4.
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
Answer: Option
Explanation:
Closed loop input impedance = 4 (1 + 0.1 x 90) = 40 kΩ,
Closed loop Output impedance = 
= 8 kΩ.
Discussion:
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