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Analog Electronic Circuits

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Why are Colpitts oscillators used to generate fixed radio-frequency signals?


Colpitts oscillators can be tuned by changing the inductance or capacitance of the tank circuit. The smooth variation of L is very difficult and for capacitive tuning, C1 and C2 must be changed simultaneously in the ratio of about 100:1, which is a difficult task. Therefore, Colpitts oscillators are used to generate fixed radio-frequency signals.