Title :
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
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;
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
DOI :
10.1109/ISCAS.2009.5118211
