Current mismatch compensation circuit of high-speed CMOS charge pump

摘要

The present invention is connected to the current mirror of the high-speed MOS charge pump used for the loop filter of the analog PLL, and auxiliary means for compensating the voltage difference with the current switching circuit, thereby reducing the current mismatch generated in the current mirror to increase the current mirror The current mismatch compensation circuit of a high-speed CMOS charge pump is capable of driving a large amount of current while having a low residual deviation between the increasing current and the decreasing current during the current switching operation. The current increasing stage current mirror auxiliary means for compensating for the current mismatch caused by the drain-source terminal voltage difference between the current input / output ends of the current increasing stage current mirror during operation is connected to the current increasing stage current mirror.