A novel demodulator for low modulation index RF signal in passive UHF RFID tag

Author

Liu, Zhongqi ; Zhang, Chun ; Li, Yongming ; Wang, Ziqiang ; Wang, ZhiHua

Author_Institution

Dept. of Electron. Eng., Tsinghua Univ., Beijing, China

fYear

2009

fDate

24-27 May 2009

Firstpage

2109

Lastpage

2112

Abstract

This paper presents a novel ASK demodulator for passive UHF RFID (radio frequency identification) tag, which can detect minimum 10% modulation index over a RF power range of 30 dB. Compared with conventional nonlinear voltage and linear current demodulations, the detection sensitivity over a wider range is increased by adopting an innovative divisional linear voltage demodulation with ultra low power consumption. The demodulator is implemented in UMC 0.18 mum mixed-mode CMOS technology. The power consumption is 3.95 muW and it can be reduced to 3.08 muW when the modulation index is large.

Keywords

CMOS integrated circuits; amplitude shift keying; demodulation; mixed analogue-digital integrated circuits; radiofrequency identification; ASK demodulator; divisional linear voltage demodulation; linear current demodulation; low modulation index RF signal; mixed-mode CMOS technology; modulation index; nonlinear voltage demodulation; passive UHF RFID tag; radio frequency identification tag; CMOS technology; Circuits; Demodulation; Energy consumption; Modulation; Passive RFID tags; Radio frequency; Radiofrequency identification; Transponders; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on

Conference_Location

Taipei

Print_ISBN

978-1-4244-3827-3

Electronic_ISBN

978-1-4244-3828-0

Type

conf

DOI

10.1109/ISCAS.2009.5118211

Filename

5118211