Electronic Devices - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 2)
2.
Refer to this figure. If the value of R1 decreases, the voltage gain will ________ and the input impedance will ________.
Discussion:
12 comments Page 2 of 2.
Shri ram said:
1 decade ago
Gain=-(Rf/Ri)
here u can c this -ve sign. If a -ve value increases means it is actually decreasing.
here u can c this -ve sign. If a -ve value increases means it is actually decreasing.
Reena said:
1 decade ago
V0/Vin=-(Rf/R1)
Gain inversely prop to R1
therefore: R1 decrease gain increase
input impedance decrease
Gain inversely prop to R1
therefore: R1 decrease gain increase
input impedance decrease
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