西安电子科技大学学报（自然科学版）2016，Vol.43Issue(2)：186-192,7.DOI:10.3969/j.issn.1001-2400.2016.02.032
应用于低压锁相环的高性能可编程电荷泵
High-performance programmable charge pump for low voltage PLLs
摘要
Abstract
This paper proposes a charge pump with a programmable output current for low voltage phase-locked loops (PLLs). It consists of two sub-units both of which leverage replica bias and feedback control techniques to achieve perfect match between charging and discharging currents. With the help of the current summing structure, the output current variation in each sub charge pump can be compensated by the other. Thus, their sum current remains relatively constant in a wide output voltage range. The charge pump can be programmed to output a 50μA ~ 1.55 mA current, with a 50μA minimum step. It is designed in a 0.13μm CMOS process and the post-layout simulation demonstrates the total current mismatch and variation rates are limited in 0.15% and 5%, over the output voltage range of 0.1~1.05 V. Such precise matching greatly suppresses the reference spur and static phase error, and the good current constancy is favorable for dynamic design. Both features render our design suitable for low voltage PLLs.关键词
电荷泵/输出电流匹配/输出电流可编程/锁相环Key words
charge pump/output current matching/programmable output current/phase-locked loop分类
信息技术与安全科学引用本文复制引用
梁亮,朱樟明,杨银堂..应用于低压锁相环的高性能可编程电荷泵[J].西安电子科技大学学报（自然科学版）,2016,43(2):186-192,7.基金项目
国家863计划资助项目(2013AA014103) （2013AA014103）
国家自然科学基金资助项目(61234002 ,61322405 ,61306044 ,61376033) （61234002 ,61322405 ,61306044 ,61376033）
电子元器件可靠性物理及其应用技术重点实验室开放基金资助项目(ZHD201302) （ZHD201302）
