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Which configuration of transistor amplifier is used for Colpitts oscillator?(a) Common emitter amplifier(b) Common collector amplifier(c) Common base amplifier(d) Combination of both common emitter and common collectorI had been asked this question during an online exam.I need to ask this question from Colpitts Oscillator-2 topic in chapter Oscillators of Analog Circuits

Answer»

Correct choice is (a) Common emitter amplifier

Easy EXPLANATION: Common emitter CONFIGURATION is used for amplifying distorted oscillatory signal to a PERFECT oscillation. The transistor PROVIDES a 180° phase shift and tank circuit another 180°, a total of 0 phase shift.



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