Phase-locked loop stabilized by a crystal oscillator

Details Phase-locked loop stabilized by a crystal oscillator Phase-locked loop stabilized by a crystal oscillator

H - Electricity

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H03L 7/00 (2006.01) H03L 7/10 (2006.01) H03L 7/14 (2006.01) H03L 7/185 (2006.01)

Patent

CA 1161127

RD-11119 PHASE-LOCKED LOOP STABILIZED BY A CRYSTAL OSCILLATOR Abstract of the Disclosure A phaselocked loop circuit, having an oscillator controlled by a voltage related to the phase difference between a reference signal and a loop signal, is stabilized by a crystal oscillator. The voltage controlled oscillator signal is frequency-subtracted from the crystal oscillator signal frequency to provide an input signal to a frequency-arithmetic synthesizer which provides a loop signal to the phase detector for comparison with the coming reference signal. Use of a frequency-adder circuit between the voltage controlled oscillator and the frequency-subtractor, and receiving an addition frequency derived from the frequency-arithmetic synthesizing circuit, is utilized to decrease the loop gain and provide enhanced characteristics.

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