锁相环中低电流失配电荷泵的设计

A Charge Pump with Low Current Mismatching Character in PLL

提出了一种应用于低供电电压低相位噪声锁相环系统的低电流失配的电荷泵电路。仿真结果表明,输出电压0.4V～1.3V范围内,电荷泵上下电流失配小于1%,满足低供电电压锁相环系统对电荷泵的要求。电路采用中芯国际0.18μm标准数字工艺参数仿真。

A low power supply charge pump in phase-locked loop （PLL） with low phase noise is proposed.The current mismatch is less than 1% when output voltage varies from 0.4 V to 1.3 V. This good performance can fulfill the requirement about charge pump in low powei supply and low phase noise PLL. The charge pump circuit is simulated in SMIC 0.18 μm standard digital CMOS process.