Jitter attenuator for direct frequency synthesizer

摘要

The direct frequency synthesis appointed jitter attenuator is disclosed. Direct frequency synthesis appointed jitter attenuator according to the present invention, in accordance with the phase control signal of the phase interpolator n frequency having a predetermined phase difference is output from the multi-phase frequency generator, and outputs a 2n frequency comprises a phase interpolated frequency a phase interpolator group, by selecting the rising edge of the frequency corresponding to the frequency selection data output from the direct frequency synthesizer of the 2n number of frequency output from the phase interpolator of the reference frequency generator and the direct frequency synthesizer for generating a reference frequency In synchronization with the output frequency to the reference frequency output from the reference frequency generating unit comprises synchronization generation unit for generating a final output frequency. Thereby, it is possible to attenuate the jitter that appears in the output frequency of the direct frequency synthesizer.