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Abstract

A direct digital synthesizer transmits a signal. The direct digital synthesizer includes a phase increment calculator, a phase accumulator, a phase-to-amplitude converter (PAC) and a phase preset calculator. The phase increment calculator determines a phase increment for a selected frequency. The phase accumulator accumulates the phase increment over time and provides an accumulated phase value. The phase-to-amplitude converter (PAC) converts the accumulated phase value to a periodic signal having the selected frequency. The phase preset calculator determines a phase preset value for the selected frequency of the periodic signal and a provided time offset for a time specified by a controlling event. The direct digital synthesizer is aligned with another direct digital synthesizer using the time offset based on measurements of a residual time alignment mismatch between the signal and another signal transmitted by the other direct digital synthesizer.

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