Phase locked loop frequency synthesizer with battery saving circ

Details Phase locked loop frequency synthesizer with battery saving circ Phase locked loop frequency synthesizer with battery saving circ

1986-05-07

1987-06-16

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 16, 331 17, 331 25, 455343, H03L 718

Patent

active

046738924

ABSTRACT:
A frequency synthesizer applicable to a radio communication equipment includes a phase comparator adapted to produce a voltage representative of a difference in phase between outputs of a variable and a fixed frequency dividers. The output of the phase comparator is applied through a switch and a low pass filter to a voltage controlled oscillator. A reset circuit produces a reset signal interlocked with a power source of the synthesizer. The variable and the fixed frequency dividers are reset by the reset signal while the switch is closed after the generation of the reset signal and opened upon turn-off of the power source.

REFERENCES:
patent: 4521918 (1985-06-01), Challen

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