Apparatus and method for spurious signal reduction in direct-dig

Details Apparatus and method for spurious signal reduction in direct-dig Apparatus and method for spurious signal reduction in direct-dig

1994-09-16

1996-05-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327551, 327105, 327113, 327106, 364721, 331 16, H03B 2100

Patent

active

055215335

ABSTRACT:
A synthesizer based upon direct-digital frequency synthesizer techniques of simplistic design and minimized spurious signal levels. The output signals of two frequency hopped direct-digital frequency synthesizers are combined with the resultant signal having a greatly suppressed spurious signal level due to the channel spacing variation of the spur. Alternate embodiments concern the number and functional location of digital-to-analog converters, varying the clock signal and the use of high-pass filters.

REFERENCES:
patent: 3772584 (1973-11-01), Barley et al.
patent: 4951237 (1990-08-01), Essenwanger
patent: 4975699 (1990-12-01), Frey
patent: 4992743 (1991-02-01), Sheffer
patent: 5014231 (1991-05-01), Reinhardt et al.
patent: 5093636 (1992-03-01), Higgins et al.
patent: 5122763 (1992-06-01), Saeki et al.

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