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  • Does Oscillator Need Feedback? If yes, Positive Or Negative?

    aarthivg

    aarthivg

    @aarthivg-HH344f
    Updated: Oct 24, 2024
    Views: 1.9K
    does oscillator require feedback.If so what type of feedback? positive of negative?
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Replies

  • B. R. Sain

    Member • Apr 14, 2012

    yes, a positive feedback is required. As oscillator does not use any input ideally so it uses positive feedback. When output is applied to the input , it is called positive feedback. This is also due to the Bakhausen criterion.
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  • anees fathima

    Member • Apr 14, 2012

    Osillator which means producing output without input, it means we give feedback as input.The input must be positive-directly taken from output,so it is called as positive feedback.If the feedback was negative, it would serve to damp the oscillation and to "kill" the oscillator.
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  • aarthivg

    Member • Apr 14, 2012

    B. R. Sain
    yes, a positive feedback is required. As oscillator does not use any input ideally so it uses positive feedback. When output is applied to the input , it is called positive feedback. This is also due to the Bakhausen criterion.
    thanks @ #-Link-Snipped-#.
    what is Bakhausen criterion
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  • silverscorpion

    Member • Apr 15, 2012

    ^^ Barkhausen criterion is a set of conditions under which a linear electronic circuit will oscillate.

    <a href="https://en.wikipedia.org/wiki/Barkhausen_stability_criterion" target="_blank" rel="nofollow noopener noreferrer">Barkhausen Stability Criterion</a>

    Actally, the 2 condtions are, simply,

    1) The loop gain should be 1 and
    2) The phase shift around the lop should be zero or a multiple of 2*pi

    If these conditions are satisfied, then that circuit will oscillate.
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  • nikhil nagunoori

    Member • Sep 30, 2018

    Why - ve feed not produce oscillations

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