Phase-continuous frequency synthesizer

Details Phase-continuous frequency synthesizer Phase-continuous frequency synthesizer

2005-06-14

2005-06-14

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

C327S113000, C327S355000, C327S361000

Reexamination Certificate

active

06906560

ABSTRACT:
A digitally controlled frequency synthesizer has a first direct digital synthesizer that generates a first phase-coherent, time-varying frequency, and a second direct digital synthesizer that generates an offset frequency waveform. A plurality of cascaded frequency converters successively combine the offset frequency waveform with a reference frequency waveform to produce a plurality of waveforms having respectively different frequencies. A switch switches between the plurality of waveforms produced by the cascaded frequency converters to realize a second waveform. The operation of the second direct digital synthesizer is controlled so as to maintain phase continuity between respective ones of the plurality of waveforms contained in the second waveform as output by the switch. A mixer multiplies the first waveform by the second waveform to produce a time-varying output frequency.

REFERENCES:
patent: 4928315 (1990-05-01), Jensen et al.
patent: 5343414 (1994-08-01), Asghar et al.
patent: 5508661 (1996-04-01), Keane et al.
patent: 5587683 (1996-12-01), Kawasaki et al.
patent: 5917367 (1999-06-01), Woo
patent: 6108626 (2000-08-01), Cellario et al.
patent: 6122223 (2000-09-01), Hossack

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