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Question

# For the circuit shown below: For a nominal gain of 4, a gain error of 0.1% and an input impedance of at least 10 kÎ©, the value of resistance R1 is _____ kÎ© and op-amp gain is ________.

A
20 and 2000
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B
40 and 5000
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C
50 and 2000
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D
10 and 5000
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Solution

## The correct option is B 40 and 5000Since both the nominal gain and the gain error are given, we must first determine the minimum op-amp gain we have R1R2=4 1A0(1+R1R2)=0.1% Thus, A0=5000 Since, the input impedance is approximately equal to R2 , We choose, R2 = 10 kΩ and R1 = 40 kΩ

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