GATE EE 2014 Set 1 — Question 59
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Analog & Digital Electronics → Operational Amplifiers → Ideal & Non-Ideal Op-Amp
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Question
Given that the op-amps in the figure are ideal, the output voltage is
Correct answer
(B) 2(V₁ - V₂)
Solution
The circuit consists of two stages. The first stage has two op-amps. Let the output of the top op-amp be and the bottom be . Due to virtual short, the voltage at the inverting terminals are and respectively. The current through the resistor is .Then, .
.The second stage is a standard differential amplifier with gain 1. The output is:
.
.The second stage is a standard differential amplifier with gain 1. The output is:
.
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