1.

Find the value of input resistance for differential amplifier with one op-amp. If R1 = R2=100 and RF = R3 =5k .

A. R<sub>IFx</sub> = 110 ; R<sub>IFy</sub> = 6.7k
B. R<sub>IFx</sub> = 100 ; R<sub>IFy</sub> = 5.1k
C. R<sub>IFx</sub> = 150 ; R<sub>IFy</sub> = 7.2k
D. R<sub>IFx</sub> = 190 ; R<sub>IFy</sub> = 9.0k
Answer» C. R<sub>IFx</sub> = 150 ; R<sub>IFy</sub> = 7.2k


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