Oscillator circuits generate periodic electrical signals by converting a fraction of the constant polarity power supply thereto into a periodic signal output without requiring a period signal input. Radio frequency (RF) oscillators are widely used for generating, tracking, cleaning, amplifying, and distributing RF carriers. Microwave oscillators are employed in wireless telecommunication equipment, such as for instance radio links or satellite transponders, as local oscillators for frequency converters. In particular, voltage-controlled oscillators with phase-locked loops are used for clock recovery, carrier recovery, signal modulation and demodulation, and frequency synthesizing. A microwave VCO is a microwave oscillator whose oscillation frequency is controllable by means of a voltage. RF oscillators and modulators typically must meet certain requirements in power and frequency output.
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