Automatic frequency control apparatus

Details Automatic frequency control apparatus Automatic frequency control apparatus

1993-10-29

1996-02-20

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 76, H04B 140

Patent

active

054937000

ABSTRACT:
The preferred embodiment of the present invention encompasses an automatic frequency control system implemented in a radiotelephone (101). The radiotelephone (101) includes a frequency synthesizer. The frequency synthesizer uses a division ratio varied with time by a multi accumulator fractional N synthesizer (140) such that the effective division ratio may be varied by non-integer steps. The division ratio is programmed to realize the desired channel frequency, the desired modulation waveform, and any automatic frequency correction offset. An accurate clock is provided to the control logic (104) and the user interface (105) sections of the radiotelephone (101) using a second multiple accumulator fractional N division system (139). This second fractional N division system (139) is programmed based on the automatic frequency control programming of the first fractional N synthesizer (140). This lower frequency may then be multiplied in a phase locked loop to provide an accurate reference at a second reference frequency.

REFERENCES:
patent: 5070310 (1991-12-01), Hietala et al.
patent: 5093632 (1992-03-01), Hietala et al.
patent: 5103192 (1992-04-01), Sekine et al.
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5166642 (1992-11-01), Hietala
patent: 5220684 (1993-06-01), Suizu
patent: 5270669 (1993-12-01), Jokura

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