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To ensure constant feedback which method is used in Colpitts oscillator ________

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To ensure constant feedback which method is used in Colpitts oscillator ________

(a) Gang tuning

(b) Using same capacitor

(c) No method is used

(d) Voltage divider always gives constant feedback

This question was addressed to me during an interview for a job.

My enquiry is from Colpitts Oscillator-2 in portion Oscillators of Analog Circuits

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Correct choice is (a) Gang tuning

Easy explanation: Frequency of oscillation is determined by the tank circuit and is varied by the gang tuning of two capacitors/center tapped capacitors. As they are tuned, thus as tuning is varied then values of both capacitors varies, and the ratio of both capacitors remains same.

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