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Phase shift provided by overall tank circuit is ___________(a) 0 degree(b) 90 degree(c) 180 degree(d) -90 degreeI got this question by my college director while I was bunking the class.I'd like to ask this question from Colpitts Oscillator-2 in chapter Oscillators of Analog Circuits

Answer»

Right option is (c) 180 degree

Explanation: The overall PHASE shift provided by tank circuit is 180 degrees. Since the active ELEMENT produces a phase shift of 180 degrees the tank circuit should CREATE 180 degrees to obey Barkhausen’s criteria.



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