摘要
电荷泵是CMOS电荷泵锁相环中的一个重要模块,其性能直接决定了整个锁相环系统的工作稳定性和各项指标的好坏,但传统结构的电荷泵却存在电荷共享、电流失配、电荷注入以及时钟馈通等问题。本设计为一种利用可调节共源共栅结构的差分输入单端输出电荷泵,采用TSMC 0.18μm RF CMOS工艺,利用Agilent公司推出的系统分析软件ADS(Advanced Design System)完成对电路的仿真。仿真结果表明该CMOS电荷泵具有相位噪声小,输出电流平滑,输出电压谐波分量低,开关延迟小等优良特性,在电荷泵输出电压范围为0.7～2.4V内,充放电电流匹配良好。
In order to solve the problems of charge sharing,current mismatch,charge injection and clock feedthrough in charge pump of traditional structure,a differential input and single-ended output charge pump in adjustable cascode structure is implemented.The circuit is designed in TSMC 0.18μm CMOS RF process.The simulation results with ADS show this charge pump has the advantages of low phase noise,smooth output current,low output voltage harmonic and small switching delay.While the output voltage of the charge pump is varied from 0.7V to 2.4V,the matching of charge and discharge currents is very good.
出处
《计算机与现代化》
2010年第11期24-26,30,共4页
Computer and Modernization
