In Reply to: voltage control oscillator posted by abdulla albanna on 10/24/02 at 3:20 AM:
A "voltage controlled oscillator" is any type of oscillator whose output frequency is controlled by an externally applied voltage.
In RF work, such oscillators are commonly made using a type of diode called a varactor. The lead-to-lead capacitance of a varactor varies inversely with the application of a bias voltage.
Adjusting that bias voltage results in adjustment of the varactor's capacitance which in turn results in an adjustment of the oscillator's frequency.
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