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A 7.5kΩ internal resistor and a 12kΩ feedback resistor are connected to an inverting amplifier. Find the error voltage, if the output voltage is 3.99mv for an input of 1.33mv.

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in Linear Integrated Circuits by (37.1k points)
A 7.5kΩ internal resistor and a 12kΩ feedback resistor are connected to an inverting amplifier. Find the error voltage, if the output voltage is 3.99mv for an input of 1.33mv.

(a) ±0.6v

(b) ±0.6mv

(c) ± 60mv

(d) ±6mv

The question was posed to me by my college professor while I was bunking the class.

I'm obligated to ask this question of Thermal Drift in section Operational Amplifier Fundamentals of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Right choice is (d) ±6mv

Simplify with an easy explanation: The output voltage of inverting amplifier is Vo= -(RF/R1)×Vin±Ev

=> Ev= ± Vo+(RF/R1)×Vin = 3.99mv+(12kΩ/7.5kΩ)×1.33mv = ±6.118 ≅ ±6mv.

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