一种可用于高性能锁相环的CMOS电荷泵

A CMOS charge pump for high-performance phase-locked loop

文章提出了一种可用于高性能锁相环的CMOS电荷泵,电路采用电流舵技术来缩短切换时间,通过降低差分对管栅电压的变化速率,显著地减小了毛刺,使输出电流波形更平滑、输出电压谐波分量更低,该电路同时还消除了死区现象;最后用CMOS电荷泵与一种典型电荷泵作仿真结果对比,突出了CMOS电路的优点。

A CMOS charge pump for the high-performance phase- locked loop is presented. The switching time is reduced by using the current steering technology： Decreasing the change rate of gate voltage in the input of differential pair transistors can remarkably reduce spikes, smooth the wave of output current and lower the voltage of output harmonic contents. At the same time, this circuit also eliminates the dead zone. This design reveals superiority over a typical charge pump in the simulation results.