A fully differential charge pump with accurate current matching and rail-to-rail common-mode feedback circuit

Author

Yang, Zhenyu ; Tang, Zhangwen ; Min, Hao

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai

fYear

2008

fDate

18-21 May 2008

Firstpage

448

Lastpage

451

Abstract

A fully differential charge pump is proposed in this paper. It adopts the replica technique to eliminate the effect of channel-length modulation, and the charging and discharging currents can match well in a wide output range. A rail-to-rail common-mode feedback circuit is employed to ensure the large swing of the charge pump unrestricted. The charge pump is designed and fabricated in SMIC 0.18 mum CMOS process. The measured reference spur-level is about -73 dBc and the in-band phase noise is nearly -90 dBc/Hz@lKHz. The power dissipation of the charge pump is only 1 mW.

Keywords

CMOS integrated circuits; circuit feedback; integrated circuit design; phase noise; CMOS process; charge pump; current matching; inband phase noise; rail-to-rail common-mode feedback circuit; size 0.18 mum; Application specific integrated circuits; CMOS process; Charge pumps; Feedback circuits; Frequency synthesizers; Laboratories; Noise measurement; Phase measurement; Phase noise; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

978-1-4244-1683-7

Electronic_ISBN

978-1-4244-1684-4

Type

conf

DOI

10.1109/ISCAS.2008.4541451

Filename

4541451