Digital frequency synthesizer

Details Digital frequency synthesizer Digital frequency synthesizer

1994-07-27

1997-04-08

Chin, Stephen

Pulse or digital communications

Transmitters

Angle modulation

364746, 332103, 327106, 327129, H04L 2720

Patent

active

056195354

ABSTRACT:
A digital frequency synthesizer employs a predetermined residue number system to generate phase angle information. The phase angle information is then converted from the predetermined residue number system into a weighted binary number. A part of the weighted binary phase angle information is used to address a read only memory that includes predetermined initial data points at each address. A predetermined iteration process that makes use of some or all of the weighted binary phase angle information that was not used to address the read only memory is then employed in an iterative process to generate final data points for the predetermined waveform. The initial data points are stored in the read only memory as weighted binary numbers and the iterative process employs weighted binary arithmetic. A second embodiment stores the initial data points in the read only memory as digits from a predetermined residue number system and the iterative process employs residue number system arithmetic. A third embodiment stores the initial data points in the read only memory as digits from a predetermined quadratic residue number system and the iterative process employs quadratic residue number system arithmetic. The final data points calculated in the second and third embodiments are converted from the predetermined residue number system or the predetermined quadratic residue number system respectively into a weighted binary system number before they are converted into analog form by a digital to analog converter.

REFERENCES:
patent: 4816805 (1989-03-01), Vojir et al.
patent: 5095279 (1992-03-01), Quan et al.
patent: 5202846 (1993-04-01), Rasmussen et al.
patent: 5430764 (1995-07-01), Chren Jr. et al.

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