Low Cost and Low Jitter DDS-Like Frequency Synthesizer

Reconfigurable clock is necessary for many applications such as digital communication systems, however, using the conventional direct digital frequency synthesizer (DDS) as a pulse or clock generator may cause jitter problems. People usually employ phase-interpolation approaches to generate a pulse or clock with correct time intervals. In this paper, a DDS-like frequency synthesizer without phase accumulator is proposed, which only uses the single capacitor integration to directly achieve the clock output with the same time intervals, such that the delay generator within phase interpolation is unnecessary. Therefore, the proposed DDS-like frequency synthesizer using single capacitor integration can significantly reduce much hardware complexity, and it also obtains a low phase jitter clock output.