一种锁相环中高性能电荷泵电路

A High Performance Charge Pump Circuit in PLL

设计了一种新型电荷泵电路．该电荷泵电路采用可调节共源共栅结构增大输出阻抗，具有结构简单、速度快、充放电电流匹配性好、抑制了电荷注入等特点．采用0．18μm CMOS工艺模型以及Hspice仿真工具的仿真结果显示，输出电压在0．4～1．3V之间变化时，电荷泵的充放电电流处处相等．

A novel structure of charge pump circuit is presented. To enlarge the output impedance, the charge pump is implemented with Regulated-Cascade structure, which has the advantages of a simple structure, a rapid speed, a very good matching of the charge and discharge currents, and charge injection. The Hspice simulation results using 0.18μm CMOS process models show that when the output voltage is changing from 0.4V to 1.3V, the charge and discharge currents are equivalent everywhere.