Electronics - Operational Amplifiers - Discussion
Discussion Forum : Operational Amplifiers - General Questions (Q.No. 10)
10.
Decreasing the gain in the given circuit could be achieved by
Discussion:
6 comments Page 1 of 1.
Dushyanth said:
1 decade ago
Why can't removing the feedback resistor be an option. Since Gain = Rf/Ri.
And Rf = ohms if we remove the feedback resistor Rf = 0. So Rf is reduced so gain will also be reduced. But why is't that a correct option.
And Rf = ohms if we remove the feedback resistor Rf = 0. So Rf is reduced so gain will also be reduced. But why is't that a correct option.
Manoj S Awakhare said:
1 decade ago
Acctually the diagram is in inverting configuration. So it has gain equation Gain= -Rf/Rin. It means gain inversly proportional to Rin. Therefore answer is C.
VATSALA SHARMA said:
1 decade ago
Gain of inverting amplifier is inversely proportional to input resistance. So, gain decreases when input resistance is increase.
Shahid said:
1 decade ago
@Dushyanth.
Removing feedback resistor will make Rf = Infinity whereas shorting it will make feedback resistor Rf=0.
Removing feedback resistor will make Rf = Infinity whereas shorting it will make feedback resistor Rf=0.
Uuumkl said:
1 decade ago
In inverting amp gain is-rf/ri if we decrease gain ri will increase.
Rashmi said:
1 decade ago
Gain of an inverting amplifier= -Rf/Ri, therefore the answer is "C".
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