Direct digital synthesizer capable of reducing spurious noise co

Details Direct digital synthesizer capable of reducing spurious noise co Direct digital synthesizer capable of reducing spurious noise co

1994-02-23

1996-09-10

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

364721, H03M 166

Patent

active

055549870

ABSTRACT:
A direct digital synthesizer (DDS) 3 comprises a phase accumulator for generating phase data in response to frequency data, periodic signal converters for generating a sine signal and a cosine signal in response to the upper bits of the phase data, phase error signal generating means for generating a phase error signal in response to the lower bits of the phase data, a multiplier for multiplying the cosine signal and the phase error signal to produce a spurious cancel signal, and a subtracter 35 for subtracting the spurious cancel signal from the sine signal, thereby obtaining a resultant sine signal free from spurious noise.

REFERENCES:
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patent: 4809205 (1989-02-01), Freeman
patent: 4901265 (1990-02-01), Kerr et al.
patent: 4933674 (1990-06-01), Gasperi et al.
patent: 4951237 (1990-08-01), Essenwanger
patent: 4975699 (1990-12-01), Frey
patent: 5039987 (1991-08-01), Ohtsuka
patent: 5291428 (1994-03-01), Twitchell et al.
patent: 5321642 (1994-06-01), Goldberg

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