Dual loop frequency synthesizer having fractional dividers

Details Dual loop frequency synthesizer having fractional dividers Dual loop frequency synthesizer having fractional dividers

1996-03-13

1997-03-11

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 25, 455 76, 455260, H03L 723

Patent

active

056105592

ABSTRACT:
A radio telephone which is capable of switching between operating through a land based cellular network and an orbiting satellite system is disclosed. First antenna and radio frequency circuits receive transmitted signals from the land-based network and form first conditioned Signals for subsequent numerical decoding. Second antenna and radio frequency circuits receive transmitted signals from the orbiting satellite system and form second conditioned signals for subsequent numerical decoding. Numerical decoders process either the first conditioned signals or the second conditioned signals to provide an automatic frequency control signal. Reference frequency oscillators controlled by the automatic frequency control signal provide a reference frequency signal. Radio frequency synthesizers using the reference frequency signal and having a first output at a first programmable frequency connected to the first radio frequency circuits determine reception of a channel frequency of the land-based network and a second output at a second programmable frequency connected to the second radio frequency circuits determine reception of a channel frequency of the orbiting satellite system.

REFERENCES:
patent: 4234929 (1980-11-01), Riley, Jr.
patent: 4963838 (1990-10-01), Hareyama
patent: 4994762 (1991-02-01), Tay
patent: 5048059 (1991-09-01), Dent
patent: 5073900 (1991-12-01), Mallinckrodt
patent: 5095288 (1992-03-01), Dent
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5129095 (1992-07-01), Davis et al.
patent: 5180993 (1993-01-01), Dent
patent: 5187805 (1993-02-01), Bertiger et al.
patent: 5289506 (1994-02-01), Kitayama et al.
F. D. Priscoli et al., "Study on the Integration between the GSM Cellular Network and a Satellite System," IEEE Telecommunications Conference, vol. 1/4, 29, Nov. 1993.

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