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Which type of feedback is used by Colpitts oscillator?

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Which type of feedback is used by Colpitts oscillator?

(a) Voltage series feedback

(b) Current series feedback

(c) Voltage shunt feedback

(d) Current shunt feedback

I got this question in semester exam.

My question is taken from Colpitts Oscillator-1 in chapter Oscillators of Analog Circuits

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Correct choice is (a) Voltage series feedback

To explain I would say: Voltage series feedback is used in Colpitts oscillator. In voltage series feedback a part of output voltage is fed back to input.

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