Electronic Devices - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 52)
52.
Calculate the overall voltage gain of the circuit if R1 = 100 and Rf = 1 k
.
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Discussion:
1 comments Page 1 of 1.
Rithwik Sivanand said:
8 years ago
For the problem,
V(+)=V(-)=0 since +ve terminal is grounded.
The voltage at the node is Zero since there is a virtual short between positive & negative terminal.
Apply KCL at the node connecting R1 & Rf.
(Vi-0)/100=(0-Vo)/1k.
Vi/100=-Vo/1k.
Gain=Vo/Vi = -1k/100 = -10.
V(+)=V(-)=0 since +ve terminal is grounded.
The voltage at the node is Zero since there is a virtual short between positive & negative terminal.
Apply KCL at the node connecting R1 & Rf.
(Vi-0)/100=(0-Vo)/1k.
Vi/100=-Vo/1k.
Gain=Vo/Vi = -1k/100 = -10.
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