Phase accumulator with dithered incrementing of accumulation due to fine phase components
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United States of America Patent
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Jan 8, 1991
Grant Date -
N/A
app pub date -
Aug 25, 1989
filing date -
Aug 25, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A phase accumulator for accumulating digital frequency words, which, as accumulated, represent the phase of a cyclic waveform of a predetermined frequency. The phase accumulator includes a coarse-component accumulator for accumulating coarse phase components of the digital frequency words; a fine-component accumulator for accumulating fine phase components of the digital frequency words; and means for incrementing the coarse-component accumulator in response to accumulation of the fine phase components. The incrementing means include means for providing a variable randomly generated value for each fine-component accumulation cycle; means for periodically sampling the accumulation of the fine phase components in relation to the randomly generated value; and means for incrementing the coarse component register for each fine-component accumulation cycle, with the phase of said incrementing being dithered in accordance with the number of times the accumulated fine phase components exceed the randomly generated values during the sampling period.
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