Spurious free wideband phase and frequency modulator using a dir

Details Spurious free wideband phase and frequency modulator using a dir Spurious free wideband phase and frequency modulator using a dir

1997-12-22

1999-03-23

Kostak, Victor R.

Television

Television transmitter circuitry

Modulator

348723, H04N 540

Patent

active

058867520

ABSTRACT:
A wideband phase and frequency modulator using a direct digital synthesis alias frequency band is described. The modulator is spurious free by the utilization of a fixed frequency at the output of the direct digital synthesizer wherein only certain submultiples of the clock frequency are used. Known frequency ratios relative to the clock frequency of the direct digital synthesizer (DDS) cause the DDS to function as a simple divider resulting in extremely low spurious levels when additional conditions are met. An additional frequency synthesizer may be utilized to achieve a tuning range since the DDS output is preferably held at a fixed frequency. At least one additional mixing operation is utilized for upconversion to a microwave frequency. Since fixed frequency ratios are used, implementation simpler than a full DDS may also be constructed consisting of digital modulators, multiplexers, digital to analog convertors, and filters.

REFERENCES:
patent: 5315619 (1994-05-01), Bhatt
patent: 5343168 (1994-08-01), Guthrie
patent: 5549111 (1996-08-01), Wright et al.
patent: 5564020 (1996-10-01), Rossi
patent: 5708436 (1998-01-01), Loiz et al.
patent: 5754437 (1998-05-01), Blazo
patent: 5786866 (1998-07-01), Sani et al.
patent: 5793818 (1998-08-01), Claydon et al.

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