In order to start up, a feedback oscillator requires______(a) unity feedback equal to 1(b) negative feedback less than 1(c) positive feedback greater than 1(d) no feedbackThe question was posed to me by my school teacher while I was bunking the class.I want to ask this question from Oscillators topic in section Power Amplifiers of Electronic Devices & Circuits

In order to start up, a feedback oscillator requires______(a) unity fe

1.	In order to start up, a feedback oscillator requires______(a) unity feedback equal to 1(b) negative feedback less than 1(c) positive feedback greater than 1(d) no feedbackThe question was posed to me by my school teacher while I was bunking the class.I want to ask this question from Oscillators topic in section Power Amplifiers of Electronic Devices & Circuits
Answer» Correct choice is (C) positive feedback greater than 1 The best explanation: In oscillators using positive feedback it is important that amplitude of the OSCILLATOR output REMAINS stable. Therefore the closed loop gain must be 1 (UNITY). In other words, the gain within the loop; PROVIDED by the amplifier, should exactly match the losses (caused by the feedback circuit) within the loop.

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