H - Electricity – 03 – B
Patent
H - Electricity
03
B
328/10
H03B 28/00 (2006.01) G06F 1/02 (2006.01)
Patent
CA 2023323
DIRECT DIGITAL FREQUENCY SYNTHESIZER ABSTRACT OF THE DISCLOSURE A frequency direct digital frequency synthesizer for generating an analog waveform of a predetermined frequency from accumulated digital frequency words which, as accumulated, represent the phase of a sine wave of said predetermined frequency. The synthesizer includes a 4-bit coarse-component accumulator for accumulating coarse phase components of the digital frequency words; means for accumulating fine phase components of the digital frequency words; means for incrementing the coarse-component accumulator in response to the accumulated fine phase components exceeding a predetermined value; a 4-bit non-linear digital-to-analog converter for converting the c bits accumulated in the coarse-component accumulator into an analog waveform of said predetermined frequency; and means for suppressing the generation of spurious frequency components in the analog waveform by randomly dithering the rate at which the coarse component accumulator is incremented by said incrementing means. A sample and hold circuit is coupled to the output of the nonlinear digital-to-analog converter for mitigating any glitch errors induced in the nonlinear digital-to-analog converter by sampling the analog waveform at such times as when glitch-induced errors are not present.
Smart & Biggar
Titan Corporation (the)
LandOfFree
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