Communication device with a frequency compensating synthesizer a

Details Communication device with a frequency compensating synthesizer a Communication device with a frequency compensating synthesizer a

1997-06-30

1999-01-05

Kinkead, Arnold

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 2, 327105, 455260, H03L 102, H03L 706

Patent

active

058567666

ABSTRACT:
A communication device including a plurality of frequency synthesizers (24, 28, 30). At least one of the frequency synthesizers (24) is driven with a reference frequency from a crystal oscillator (58). The at least one frequency synthesizer (24) includes a phase locked loop with a fractional-N divider (48) which is programmed by a control circuit (64) to vary as a function of temperature compensation, frequency compensation, and a frequency multiplication factor. The output (46) of the at least one frequency synthesizer (24) is used to provide a compensated reference frequency input for the remaining frequency synthesizers (28, 30). The radio provides all the frequency synthesizers (24, 28, 30) with temperature and frequency compensation using a reference frequency from a crystal oscillator (58) and only one high resolution frequency compensating synthesizer (24).

REFERENCES:
patent: 4720688 (1988-01-01), Hasegawa et al.
patent: 5204972 (1993-04-01), Hashimoto
patent: 5309102 (1994-05-01), Deckard
patent: 5436600 (1995-07-01), Van Heteren
patent: 5576666 (1996-11-01), Rauvola
patent: 5604468 (1997-02-01), Gillig

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