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
1.The op-amp is ideal and has negative feedback through the resistor.
2.For an ideal op-amp with negative feedback, the virtual short concept applies: .
3.The non-inverting terminal () is connected directly to ground, so .
4.Therefore, the voltage at the inverting terminal () must also be .
5.Node A is connected to the inverting terminal, so .
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