The CDMA2000 base station uses the GPSS/GLONASS standard second signal as the clock synchronization reference of the whole system and adopts a PLL (phase-locked loop) + DDS (direct digital frequency synthesizer) + PI structure to realize it. The overall scheme of the clock synchronization system is introduced, and the circuit design and parameter setting of the post-stage DDS + PLLS composed of ADD9851 and LMX2306 are emphasized. The stability and applicability of the scheme are analyzed based on the experimental results.
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