The differential output circuit not only reduced the voltage noise created by leakage current, but also increased the ascending/descending speed to improve the speed of PEE further and enlarged the range of output voltage.

• 采用差分输出不仅能够降低电荷泄漏所带来的电压噪声，而且能够提高电荷泵的上升和下降速度，从而提高锁相环的工作速度，还能增大输出电压的范围。