Phase continuous signal generation using direct digital synthesis
AssigneeInternational Business Machines Corporation
InventorsMohit Kapur, Muir Kumph, Jiri Stehlik
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Abstract
An aspect includes a direct digital synthesis system including a waveform generator with a waveform memory operable to store a plurality of waveform vectors and output a selected waveform vector. The direct digital synthesis system also includes a digital-to-analog converter operable to convert the selected waveform vector from a digital value to an analog signal responsive to a reference clock. The direct digital synthesis system further includes a controller operable to maintain phase continuity of the analog signal when an output of the analog signal is interrupted and restored.
Claims25
A direct digital synthesis system comprising:
- a waveform generator comprising a waveform memory operable to store a plurality of waveform vectors and output a selected waveform vector;
- a digital-to-analog converter operable to convert the selected waveform vector from a digital value to an analog signal responsive to a reference clock;
- a controller operable to maintain phase continuity of the analog signal when an output of the analog signal is interrupted and restored;
- and
- a signal error detector configured to determine a phase error of the analog signal with respect to a local oscillator driven by the reference clock.
A method for direct digital synthesis, the method comprising:
- outputting a selected waveform vector from a waveform generator comprising a waveform memory operable to store a plurality of waveform vectors;
- converting the selected waveform vector from a digital value to an analog signal using a digital-to-analog converter responsive to a reference clock;
- maintaining phase continuity of the analog signal when an output of the analog signal is interrupted and restored;
- and
- determining a phase error of the analog signal with respect to a local oscillator driven by the reference clock.
A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by processing circuitry to cause the processing circuitry to perform:
- controlling a waveform generator to output a selected waveform vector, the waveform generator comprising a waveform memory operable to store a plurality of waveform vectors;
- controlling a digital-to-analog converter to convert the selected waveform vector from a digital value to an analog signal responsive to a reference clock;
- maintaining phase continuity of the analog signal when an output of the analog signal is interrupted and restored;
- and
- determining a phase error of the analog signal with respect to a local oscillator driven by the reference clock.
Dependencies are inferred from the claim text.