Frequency synthesizing device

Details Frequency synthesizing device Frequency synthesizing device

1989-10-18

1991-05-28

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 15, 307271, 331 1R, H03L 700, H03B 1900

Patent

active

050197851

ABSTRACT:
A frequency synthesizing device comprises two reference frequency generators RG1 and RG2, an offset stage OS and a phase-locked loop PLL. In the phase-locked loop, which operates as a tracking filter, the output frequency fs.sub.A is generated by the addition of the frequencies f.sub.RG1 and f.sub.OS. The output frequency fs.sub.A has a very high spectral purity, since all interfering spurious signals are blocked by the tracking filter. By a proper selection of the reference frequencies f.sub.RG1, f.sub.RG2 and f.sub.OR, it is ensured that all interfering spurious signals lie outside the bandwidth B.sub.TF of the tracking filter and are accordingly blocked. As a result, it is not necessary to filter the signals S.sub.RG1, S.sub.RG2 and S.sub.OS.

REFERENCES:
patent: 4070634 (1978-01-01), Barker et al.
patent: 4667168 (1987-05-01), Shiomi et al.
patent: 4839603 (1989-06-01), Mower et al.
patent: 4847516 (1989-07-01), Fujita et al.
patent: 4862106 (1989-08-01), Toda et al.
patent: 4878027 (1989-10-01), Carp et al.
European Search Report on Application RS 83147 CH.
The Radio and Electronic Engineer, vol. 50, No. 3, Mar. 1980, pp. 122-126, Institution of Electronic and Radio Engineers, London, GB; G. A. Warwick et al.: "The Frequency Shifting Synthesizer".
Patent Abstracts of Japan, vol. 9, No. 185 (E-332) (1908), Jul. 31, 1985 and JP-A-60 55 730 (Nippon Denki K.K.), 01/04/1985.

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