State the Barkhausen criterion for sustained oscillation. Explain the operation of Colpitts oscillator. A Colpitts oscillator oscillates with frequency 10 MHz, determine the equivalent capacitance, C forming tank circuit with 0.1 mH inductor.

The Barkhausen criterion is fundamental in understanding sustained oscillation in electronic circuits. It states that for a circuit to produce sustained oscillations at a particular frequency, the loop gain around the feedback loop must be equal to or greater than 1 and the phase shift around the loop __________ ___ _______ ______ ___ __________ ______ _____.
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