Design of a CMOS Adaptive Charge Pump with Dynamic Current Matching

• Published in: Wuhan University journal of natural sciences Vol. 11; no. 2; pp. 405 - 408
• Main Authors: Tao, Zhang, Xuecheng, Zou, Guangzhou, Zhao, Xubang, Shen
• Format: Journal Article
• Language: English
• Published: Institute of Pattern Recognition and Artifical Intelligence, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China%Institute of Pattern Recognition and Artifical Intelligence, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China 01.03.2006; Xi'an Microelectronic Technology Institute, Xi'an 710054, Shaanxi, China; Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China%Institute of Pattern Recognition and Artifical Intelligence, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
• Subjects: 电流匹配; 相位补偿; 相位频率探测器; 进料泵; 锁相环路; phase offset; charge pump; phase-locked loop; phase frequency detector; current matching; low voltage difference signal
• ISSN: 1007-1202; 1993-4998
• DOI: 10.1007/BF02832132

A novel structure for a charge pump circuit is proposed, in which the charge-pump （CP） current can adaptively regulated according to phase-locked loops （PLL） frequency synthesis demand. The current follow technology is used to make perfect current matching characteristics, and the two differential inverters are implanted to increase the speed of charge pump and decrease output spur due to theory of low voltage difference signal. Simulation results, with 1st silicon 0. 25μm 2. 5 V complementary metal-oxide-semiconductor （CMOS） mixed-signal process, show the good current matching characteristics regardless of the charge pump output voltages.