Does Oscillator Need Feedback? If yes, Positive Or Negative?
does oscillator require feedback.If so what type of feedback? positive of negative?
Replies
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B. R. Sainyes, 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 fathimaOsillator 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
thanks @ #-Link-Snipped-#.B. R. Sainyes, 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.
what is Bakhausen criterion -
silverscorpion^^ Barkhausen criterion is a set of conditions under which a linear electronic circuit will oscillate.
Barkhausen Stability Criterion
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. -
nikhil nagunoori
Why - ve feed not produce oscillations
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