摘要
一般的CMOS电荷泵有充放电流失配的问题。电流失配导致了相位偏差。本文研究了一般CMOS电荷泵电流失配产生的原因,提出了一种新型的电荷泵。利用误差放大器和参考电流源以获得良好的电流匹配特性,降低了锁相环的相位噪声;利用电荷移除管有效地抑制了电荷共享。采用chartered 0.35um COMS工艺进行仿真。仿真结果显示该电路有很好的电流匹配特性。
Conventional CMOS charge pump circuits have some current mismatching characteristics. The current mismatch of the charge pump in the PLLs generates a phase offset. This paper investigates causes of current mismatch of conventional CMOS charge pump and proposes new charge pump circuits. By using an error amplifier and reference current sources, one can achieve a charge pump with good current matching characteristics. And by using the charge removal transistors, one can eliminate charge sharing, it was designed by chartered 0.35um CMOS technology and simulated by Spectre tools. Simulation results show the good current matching characteristics.
出处
《微计算机信息》
北大核心
2008年第29期265-266,264,共3页
Control & Automation
基金
国家自然科学基金项目(60773081)项目名称:平板显示器灰度控制的分形方法研究及IP核实现
上海市教育委员会科研项目(07ZZ08)项目名称:FPD超高灰度多重子空间扫描研究
关键词
锁相环
电荷泵
相位误差
Phase locked-loop
Charge pump
phase offset
