Pseudorandom dither for frequency synthesis noise

Details Pseudorandom dither for frequency synthesis noise Pseudorandom dither for frequency synthesis noise

1987-12-14

1990-02-13

Harkcom, Gary V.

Boots, shoes, and leggings

328 14, G06F 102

Patent

active

049012657

ABSTRACT:
A method and apparatus for reducing spurious output noise in digital frequency synthesizers employing sine amplitude converters connected to Digital-to-Analog converters to generate analog waveforms from sine amplitude data. Random or pseudorandom numbers having a value equal to or less than plus or minus one-half of a minimum quantization step or value change for the sine amplitude data are generated and added to the sine amplitude data with the resulting sum being transferred to the Digital-to-Analog converter. In one embodiment, a summation circuit is connected between an output of the sine function converter and an input of the Digital-to-Analog converter and also has a second input connected to a pseudorandom number generator which provides Pseudorandom numbers varying in value over a range of .+-.1/2.sup.n+1 times a least significant step value, or bit for base 2, of a corresponding Digital-to-Analog input data value where n is greater than or equal to 1.

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patent: 4727506 (1988-02-01), Fling
Schuchman, "Dither Signals and Their Effect on Quantization Noise", IEEE Transactions on Communication Technology, Dec. 1964, pp. 163-165.

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