GATE EE 2015 Set 2 — Question 49
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Analog & Digital Electronics → Operational Amplifiers → Comparator & Schmitt Trigger
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Question
The saturation voltage of the ideal op-amp shown below is . The output voltage of the following circuit in the steady-state is
Correct answer
(A) square wave of period 0.55 ms.
Solution
The given circuit is a relaxation oscillator (astable multivibrator). The output of the op-amp will be a square wave switching between and .
The feedback factor is .
The period of the output square wave is given by:Substituting the values , , and :Since is the output of the op-amp, it is a square wave of period .
The feedback factor is .
The period of the output square wave is given by:Substituting the values , , and :Since is the output of the op-amp, it is a square wave of period .
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