Phase locked loop frequency synthesizer

Details Phase locked loop frequency synthesizer Phase locked loop frequency synthesizer

1992-06-16

1993-11-02

Chin, Stephen

Pulse or digital communications

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333 1A, 333 25, H03D 324

Patent

active

052590070

ABSTRACT:
A PLL Frequency Synthesizer includes a reference signal source which outputs a reference frequency signal. A phase of the signal out of the reference signal source and a phase of a signal coming back through a feed-back loop are compared by a phase comparator which detects the phase difference between them. The output of the comparator is integrated by a low pass filter which generates a voltage output corresponding to the phase difference. A voltage controlled oscillator is also provided to the PLL Frequency Synthesizer of the invention, an output frequency of which is controlled by the amplitude of a signal out of the low pass filter. The output signal out of the voltage controlled oscillator is divided by a variable divider whose denominator can be variable from outside. A frequency multiplier is provided between the phase comparator and the variable divider so as to multiply the frequency of signal derived from the variable divider.

REFERENCES:
patent: 4748644 (1988-05-01), Silver
patent: 5052031 (1991-09-01), Molloy
patent: 5057794 (1991-10-01), Shih

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