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[7/8] Problem (5) Consider the circuits shown belwow and assume ideal op-amps. Decide whether they can oscillate or not. In e

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Answer #1

Condition for oscillations 1)magnitude of the loop gain must be unity. 2) phase shift around the loop must be 360o or 0o. ​​​​​​

In the above two op-Amps first op-amp is providing 180o phase shift because it is given to inverting stage. the passive components resistor and capacitors are providing only 120o so it is not satisfying the 2 condition of the oscillations.

In the second op-amp the passive components are providing 180o phase shift. But the op-Amp is non inverting stage, so it is not providing any phase shift. So this op amp is also not a oscillator.

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