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The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be

The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be Correct Answer <img alt="GATE IN Signals and digital 30Q Sunny.docx 9" src="//storage.googleapis.com/tb-img/production/19/06/GATE%20IN_Signals%20and%20digital_30Q_Sunny.docx%209.PNG" style="width: 244px; height: 134px;">

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For Vin > 0 V,

Va > Vb and the diode becomes ON.

Now, the circuit becomes

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The above circuit represents voltage follower circuit.

So, the output voltage V0 = Vin

For Vin < 0 V

Va < Vb and the diode becomes OFF.

Now, the circuit becomes

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Virtual Ground concept is NOT valid for open loop system.

Therefore,

V0 = 0 V

Now, the transfer characteristic for the given circuit are:

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