Electronics and Communication Engineering - Analog Electronics - Discussion
Discussion Forum : Analog Electronics - Section 4 (Q.No. 41)
41.
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
Answer: Option
Explanation:
Input impedance with feedback = (1 kΩ) (1 + 100 + 0.99) = 100 kΩ. Output impedance with feedback = 
.
Discussion:
4 comments Page 1 of 1.
Leendon said:
6 years ago
Use the most common mode for amplifier, which is the Voltage-Series.
KF said:
8 years ago
Input impedance with feedback = (1 kΩ) (1 + 100 + 0.99) = 100 kΩ.
Output impedance with feedback =1Ω.
Output impedance with feedback =1Ω.
Amod kumar Jha said:
8 years ago
Questions itself is not clear.
Which topology is this negative feedback has A/c that i/p and o/p resistance changes?
Which topology is this negative feedback has A/c that i/p and o/p resistance changes?
Krishna prasad said:
10 years ago
I/P impedance = 1 k*(1+100*0.99) = 100 k.
Formula = r*(1+ab).
Formula = r*(1+ab).
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