An LTPS TFT Demodulator for RFID Tags Embeddable on Panel Displays

Author

Yu, Yueh-Hua ; Lee, Yuan-Jiang ; Li, Yu-Hsuan ; Kuo, Chung-Hung ; Li, Chun-Huai ; Hsieh, Yao-Jen ; Liu, Chun-Ting ; Chen, Yi-Jan Emery

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei

Volume

57

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

1356

Lastpage

1361

Abstract

This paper presents an amplitude-shift-keying (ASK) demodulator for RF identification tags, which can be embedded on panel displays. The ASK demodulator was implemented in 3-mum low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT) technology. Since the threshold voltages of LTPS TFTs are higher than CMOS transistors, the conventional demodulator implementation will degrade the demodulator sensitivity significantly. The novel full-wave demodulator circuit was proposed to resolve the issue of high threshold voltage and reduce the ripples of the demodulated envelope. Operated at 8 V, the demodulator consumes 1.6 mW of power. The input carrier frequency was tested up to 13.56 MHz, and the highest ASK modulated data rate is 100 kb/s. The circuit size of the LTPS TFT demodulator is 500 mum times 450 mum.

Keywords

amplitude shift keying; demodulators; display devices; radiofrequency identification; thin film transistors; LTPS TFT demodulator; RFID tags; amplitude-shift-keying demodulator; low-temperature polycrystalline silicon thin-film transistor; panel displays; power 1.6 mW; voltage 8 V; Demodulator; RF identification (RFID); low-temperature polycrystalline silicon (LTPS); system on panel (SoP); transponder;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2009.2017312

Filename

4814531