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Operational Amplifiers - Technical MCQs

Q1:

If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?

A 3.5 mV

B ground

C 1.42 mV

D 0.56 mV

ANS:C - 1.42 mV

Vo=Vin(1+Rf/Rin)).

Vo=1.42*10^3(1+2.5*10^3/100.0)
Vo=4.97mV.
The Voltage across Rin=Rin*Vo/Rin+Rf.
= 1.42mV.