Consider a differential amplifier shown in the figure below: If the two input terminals are connected together to an input common mode signal and R2R3=R1R4 then the input common mode resistance is equal to
A
R1+R3||R2+R4
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B
R1||R3+R2||R4
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C
(R1+R2)||(R3+R4)
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D
(R1+R3)||(R2+R4)
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Solution
The correct option is C(R1+R2)||(R3+R4) V+=VcmR4R3+R4