Computer and Modernization ›› 2010, Vol. 1 ›› Issue (11): 24-26,3.doi: 10.3969/j.issn.1006-2475.2010.11.007

• 计算机仿真 • Previous Articles     Next Articles

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

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

CLC Number: