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• The Colpitts oscillator utilizes a tank circuit (LC) in the feedback loop. The
resonant frequency can be determined by the formula below. Since the input
impedance affects the Q, an FET is a better choice for the active device.
• An Op amp Colpitts Oscillator circuit can also be used wherein the Op amp
provides the basic amplification needed and the Oscillator frequency is set by an
LC feedback network.
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