Electronic Devices - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 24)
24.
Refer to the given figure. You need an amplifier with an input impedance of 12 k
. You must not change the amplifier voltage gain. The new value of Ri would be ________ and the new value of Rf would be ________.
10 k, 100 k
, 100 k13.3 k, 120 k
, 120 k12 k, 108 k
, 108 k12 k, 120 k
, 120 kDiscussion:
1 comments Page 1 of 1.
Arif said:
1 decade ago
We know,
Gain(Vo) = -Rf/Ri.
Now the gain is -10.
Ri = 12ohm(given).
Now -10 = -rf/12.
Gain(Vo) = -Rf/Ri.
Now the gain is -10.
Ri = 12ohm(given).
Now -10 = -rf/12.
(2)
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