计算机与现代化 ›› 2010, Vol. 1 ›› Issue (11): 24-26,3.doi: 10.3969/j.issn.1006-2475.2010.11.007

• 计算机仿真 • 上一篇    下一篇

一种应用于CMOS电荷泵锁相环中的新型电荷泵

孙鹏,徐元旭,姚恩义,胡永双   

  1. 哈尔滨工业大学微电子科学与技术系,黑龙江 哈尔滨 150006
  • 收稿日期:2010-07-29 修回日期:1900-01-01 出版日期:2010-11-25 发布日期:2010-11-25

A New Charge Pump for CMOS Charge Pump Phase Locked Loop

SUN Peng, XU Yuan-xu, YAO En-yi, HU Yong-shuang   

  1. Department of Microelectronic Science and Technology, Harbin Institute of Technology, Harbin 150006, China
  • Received:2010-07-29 Revised:1900-01-01 Online:2010-11-25 Published:2010-11-25

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。

关键词: CMOS, 电荷泵, 电荷共享, 电流失配

Abstract:

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.

Key words: CMOS, charge pump, charge sharing, current mismatch

中图分类号: