Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

1988-11-02

1989-12-19

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 12, 331 21, 331 25, 375120, H03L 708

Patent

active

048885649

ABSTRACT:
A PLL circuit having a function of a frequency multiplier comprises a phase detector circuit receiving an input signal, for producing an error signal which includes an alternating current component having a relatively high frequency depending on the frequency of a frequency-multiplied signal, a low pass loop filter, a voltage controlled oscillator, and a comparison signal generating circuit for generating N phase comparison signals. The phase detector circuit comprises a phase splitting circuit for generating from the input signal N phase split signals having respectively different N phases and N phase detectors for comparing the phases of the N phase split signals with different phases of the N phase comparison signal respectively.

REFERENCES:
patent: 3571743 (1971-03-01), Menkes

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