Electronics - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - Filling the Blanks (Q.No. 8)
8.
The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin = 3 M
, Zout = 80 , and Aol = 250,000.
4.7 k
22.7 k
3 M
68.6 k
Discussion:
4 comments Page 1 of 1.
YayyaY said:
1 decade ago
The differential input impedance of the operational amplifier is defined as the impedance between its two inputs; the common-mode input impedance is the impedance from each input to ground. (from wiki)
So in this case, it is Ri.
So in this case, it is Ri.
Manu M. said:
1 decade ago
It is used in inverting mode. In inverting mode, Input impedance is equal to Ri.
Satyendra shgal said:
9 years ago
Because of virtual ground, Ri is the input impedance.
Vandana said:
1 decade ago
Please help me to solve this problem.
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