Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1991-10-15
1992-09-29
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
4551651, 4551821, 4551831, 4551921, 455260, 331 2, 331 25, H04B 140, H04B 1702, H03L 700
Patent
active
051520052
ABSTRACT:
The synthesizer includes an output PLL having a divide-by-N1 divider in its feedback loop. The output PLL is couples through frequency offset circuitry to receive a reference signal from a driver PLL having a divide-by-N2 divider in its feedback loop. Another divide-by-N1 divider coupled a reference oscillator to the driver PLL. The reference oscillator provides another reference signal. As a result, the setting for N1 controls the course frequency tuning and the setting for N2 controls the fine frequency tuning of the synthesizer which provides any one of a plurality of selectable predetermined output frequencies. The adjacent selectable frequencies are closer together than the frequencies of the reference signals. The synthesizer has a simple configuration and provides a high degree of output frequency resolution, fast acquisition and low noise.
REFERENCES:
patent: 4542531 (1985-09-01), Fukumura
patent: 4593411 (1986-06-01), Schiller
patent: 4791387 (1988-12-01), Hasegawa et al.
patent: 4940950 (1990-07-01), Helfrick
patent: 4963838 (1990-10-01), Hapeyama
IEEE, vol. CE-24, No. 1, Feb. 1978 "A New Design Technique for Digital PLL Synthesizers", BREEZE,E.
Eisenzopf Reinhard J.
Faile Andrew
Handy Robert M.
Jones Maurice J.
Motorola Inc.
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