Phase locked loop frequency synthesizer with fast frequency swit

Details Phase locked loop frequency synthesizer with fast frequency swit Phase locked loop frequency synthesizer with fast frequency swit

1994-03-30

1995-04-11

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 16, 331 25, H03L 7085, H03L 718

Patent

active

054062292

ABSTRACT:
A frequency synthesizer, which realizes speed-up of channel switching between channels having separated frequencies, has an EEPROM which stores the phase difference between a first frequency divider and a second frequency divider producing outputs corresponding to the frequencies of the channels to be switched. A delay circuit delays the output of the second frequency divider by an amount corresponding to an amount of the phase difference stored in the EEPROM. A controller supplies the outputs of the second frequency divider and the delay circuit to a phase detector. Further, the controller stops a PLL operation and restarts it in synchronism with a leading edge of, preferably, a second period of the output signal of the reference oscillator to which the preset phase difference is given.

REFERENCES:
patent: 3921095 (1975-11-01), Chu
patent: 4442412 (1984-04-01), Smith et al.
patent: 5036295 (1991-07-01), Kamitani
patent: 5126693 (1992-06-01), Gulliver et al.
patent: 5334952 (1994-08-01), Maddy et al.

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