Direct digital synthesizer and phase locked loop frequency synth

Details Direct digital synthesizer and phase locked loop frequency synth Direct digital synthesizer and phase locked loop frequency synth

1993-12-08

1995-06-27

Grimm, Siegfried H.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

331 18, 331 25, H03K 380, H03L 718

Patent

active

054283086

ABSTRACT:
A direct digital synthesizer which can be switched at a high speed and generates signals having a relatively high frequency with low power consumption; including a clock generator, a frequency setting circuit in which phase increment for unit clock can be programmed, a phase accumulator in which phase increment is accumulated, a ROM which outputs a digital signal corresponding to cumulative phase output, a D/A convertor which inverts polarity of output in each clock time, and a band-pass filter. The output of the band pass filter may be used as a reference input to a phase locked loop.

REFERENCES:
patent: 4905177 (1990-02-01), Weaver, Jr. et al.
patent: 4926130 (1990-05-01), Weaver
patent: 4965533 (1990-10-01), Gilmore
patent: 5081603 (1992-01-01), Mikos
Electronics World & Wireless World, vol. 97, No. 1678, Sep. 1992, Surrey GB pp. 746-748 "Direct Digital Synthesis".
IEEE Colloquium on "Direct Digital Frequency Synthesis", Nov. 19, 1991, IEE, London, UK pp. 5.1-5.4 M. Bozic Spurious Redistributing Direct Digital Synthesizer (SRDDS).
IEEE Colloquium on "Direct Digital Frequency Synthesis", Nov. 19, 1991, IEE, London, UK pp. 4.1-4.5 M. P. Wilson et al. Spurious Reduction Techniques for Direct Digital Synthesis.
Electronics World and Wireless World, vol. 98, No. 1678, Oct. 1992, Surrey GB pp. 842-845, XP 315541 Ian Hickman "Genuine solutions to spurious arguments".
Electronics World and Wireless World, Oct. 1991, Surrey GB pp. 845-846, XP000264833 Ian Hickman "Design brief: voltage references".

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