GATE EC 2018 Set 1 — Question 48
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Analog Circuits → Op-Amp Circuits → Ideal & Non-Ideal Op-Amp
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Question
An op-amp based circuit is implemented as shown below. 
In the above circuit, assume the op-amp to be ideal. The voltage (in volts, correct to one decimal place) at node A, connected to the negative input of the op-amp as indicated in the figure is _________.
Correct answer
0.4 to 0.6
Solution
If the op-amp stayed linear, V, which is impossible with V supplies. So the output saturates at V and the virtual-ground assumption no longer holds.With no current into the ideal op-amp input, the and resistors form a divider between V and V:(Consistency: , so the output is indeed driven to negative saturation.)Answer: 0.5 V
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