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Analog Electronic Circuits

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4 out of 10

Explain why positive feedback and not negative feedback is necessary to produce oscillations?


In negative feedback, the feedback factor βA is less than unity. Therefore, βAVin is less than Vin and so the output signal will die out. In positive feedback, the feedback factor βA is greater than unity. As βAVin is greater than Vin, an oscillation output signal will be generated.