Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1988-06-23

1989-06-20

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 16, 331 18, 331 25, H03L 718

Patent

active

048412554

ABSTRACT:
A first oscillator outputs a signal having a reference frequency. A first frequency divider divides the frequency of the output signal from the first oscillator. A second oscillator outputs a signal having a target frequency. A second frequency divider divides the frequency of the output signal from the second oscillator. A phase comparator compares phases of output signals from the first and second frequency dividers. An integrator integrates an output signal from the phase comparator and controls the second oscillator in accordance with the integration of the output signal from the phase comparator. A first gate is connected between the first oscillator and the first frequency divider. A second gate is connected between the second oscillator and the second frequency divider. A third gate is connected between the phase comparator and the integrator. The first gate, the second gate, and the third gate are controlled in accordance with the output signals from the first and second frequency dividers and with an external synthesizer control signal.

REFERENCES:
patent: 4673892 (1987-06-01), Miyashita et al.

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