介绍了一种应用于GHz级高速频率合成器的数模混合下变频模块.采用了高速射频双模预分频器与数字逻辑综合生成的可编程吞脉冲分频器相结合的设计方法.双模预分频实现了高速低抖动低功耗,双模预分频器工作在除8状态输出133MHz频率时,均方差抖动小于2ps;可编程吞脉冲分频器算法灵活、设计复用性强,该算法可以灵活运用到许多复杂频率综合系统.相比较而言,该设计获得了更好的高频电路性能与设计复用性. A digital-to-analog hybrid down-conversion module for high-speed GHz frequency synthesizers is introduced, which combines the design of a high-speed RF dual-modulus prescaler and a programmable logic pulse divider integrated with digital logic. Mode prescaler to achieve high-speed low-jitter low-power, dual-mode prescaler work in addition to the 8 state output 133MHz frequency, the average variance jitter less than 2ps; programmable swallow pulse divider algorithm flexibility, strong design reusability , The algorithm can be flexibly applied to many complex frequency synthesis systems, and the design achieves better high frequency circuit performance and design reusability.