GATE EC 2016 Set 1 — Question 50
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Analog Circuits → Calculus → Sequences, Series & Convergence
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Question
An ideal opamp has voltage sources connected to the non-inverting input and connected to the inverting input as shown in the figure below (, ). The voltages are , respectively. As approaches infinity, the output voltage (in volt) is ___________
Correct answer
14.9 to 15.5
Solution
The non-inverting terminal voltage is a weighted average of the odd-indexed sources, and the inverting terminal voltage is a weighted average of the even-indexed sources. For an ideal opamp with infinite open-loop gain , the output voltage is , limited by the supply rails . Given the source values , the non-inverting inputs are positive () and the inverting inputs are negative (). Consequently, will be positive and will be negative. The differential input is strictly positive. As , the gain causes the opamp to saturate at the positive supply rail. Therefore, .
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