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Calculate the output voltage for the given circuit using the specification: R1 = 820Ω; ROM=811.882Ω; Vin=10mVpp; VOIB≅0.

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in Linear Integrated Circuits by (37.1k points)
Calculate the output voltage for the given circuit using the specification: R1 = 820Ω; ROM=811.882Ω; Vin=10mVpp; VOIB≅0.

(a) 1.025Vpp

(b) 1.8Vpp

(c) 1Vpp

(d) 2Vpp

I had been asked this question in my homework.

Origin of the question is Input Bias Current topic in chapter Operational Amplifier Fundamentals of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate choice is (c) 1Vpp

Here's the scoop: Offset minimizing resistor, ROM = (R1*RF)/(R1+ RF)

=> RF = (ROM* R1)/( R1– ROM) = (812Ω*811.882Ω)/(820Ω-811.882Ω) = 82kΩ.

∴ Vo = -(RF/ R1)* Vin = -(82kΩ/820Ω)*10mVpp = 1Vpp.

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