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Jingchao Wang

Biography

Enrollment Date: 2005

Graduation Date：2010

Degree：Ph.D.

Defense Date：2010.06.12

Advisors：Zhihua Wang

Department：Institute of Microelectronics，Tsinghua University

Title of Dissertation/Thesis：Research on Key Issues and Chip Design of UHF RFID Reader

Abstract:
The UHF passive RFID technology has been regarded as one of the most promising RFID technologies. The cost, power consumption and safety of UHF RFID reader are important factors that affect the system application. According to the specific requirements of applications, this dissertation has following achievements on RFID reader system efficiency, low power design, security and single-chip reader design: The transmitter architecture of RFID reader based on digital-IF is proposed to get a higher sideband suppression ratio. Compared with the transmitter based on direct up-conversion architecture, the new transmitter’s single side band suppression ratio is increased from less than 40dB to higher than 50dB. Higher spectrum utilization efficiency is achieved. So a higher communication data rate can be realized in the same bandwidth and higher system identification efficiency is realized. Compared to the traditional solution, the area and power consumption of the digital-IF reader transmitter based on 0.18μm CMOS technology are reduce by more than 20%. A high efficient transmitter design method is proposed. It uses linear power amplifier and non-liner power amplifier alternately according to the UHF RFID communication theory, which solves the problem of low efficiency induced by using linear amplifier in existing transmitter. The new transmitter improves the circuit efficiency while meeting the spectral mask. Hardware test results show that the new structure improve the transmitter power amplifier efficiency from 6.7% to 29.71%. A proactive anti-interception method used in data link layer encryption is proposed to solve the contradiction between the limited processing ability of the passive tags and the high security requirements of application in UHF RFID system. Software simulation and hardware test results show that the new method can jam third party listener effectively without affecting self-receiving. This improves the communication security only with modifies of reader and no changes of existing tags. A single-chip reader transceiver for the portable applications is implemented. The transceiver integrates transmitter chain, receiver chain, local oscillator and power amplifier on one chip. The proposed reader IC achieves 16.4dBm power output and -60dBm sensitivity with 231.2mW power consumption by circuit architecture optimization and performance trade off. The reader can communicate with a commercial tag within a distance of more than 50cm. A single-chip reader SoC is implemented. The IC integrated a microprocessor and a protocol processing module besides the proposed reader transceiver. The IC supports different communication data rate and encoding/decoding method by configurable control and status registers. The IC is capable of multi-protocol processing ability. To the author’s knowledge, the proposed SoC is the only UHF RFID reader IC which integrates modem, MCU, RF transceiver and power amplifier on one chip.

Publications

Papers：：

[1] Jingchao Wang,Chun Zhang,Zhihua Wang, A Fully Integrated UHF RFID Reader SoC for Handheld Applications in 0.18µm CMOS Process, Chinese Journal of Semiconductors, Vol.31, No.8, pp. 085005 - 1, 2010.

[2] Jingchao Wang,Chun Zhang,Zhihua Wang, A low power low cost fully integrated UHF RFID reader with 17.6dBm output P1dB in 0.18 µm CMOS process, RFIC 2010, pp. 109 - 112, 2010.

[3] Yongqing Fu,Chun Zhang,Jingchao Wang, A Research on Denial of Service Attack in Passive RFID System, ASID 2010, pp. 24 - 28, 2010.

[4] Liang Lu,Chun Zhang,Jingchao Wang, A Digital IF Based UHF RFID Reader Transmitter, APCCAS 2010, pp. 963 - 966, 2010.

[5] Ni Chen,Chun Zhang,Yan Zhao,Jingchao Wang,Kun Yang, Design of a Refueler Coder IC Based on IP Core, Microelectronics, Vol.39, No.2, pp. 229 - 232, 2009.

[6] Jingchao Wang,Chun Zhang,Baoyong Chi,Ziqiang Wang,Fule Li,Zhihua Wang, A Low Cost Integrated Transceiver for Mobile UHF Passive RFID Reader Applications, Chinese Journal of Semiconductors, Vol.30, No.9, pp. 095007 - 1 - 5, 2009.

[7] Tongqiang Gao,Jingchao Wang,Chun Zhang,Baoyong Chi,Zhihua Wang, A Novel CMOS Transmitter Front-end for Mobile RFID Reader, RFIC 2009, pp. 105 - 108, 2009.

[8] Chun Zhang,Wenqiang Zhang,Ziqiang Wang,Jingchao Wang, A 1.65 mW Direct-Conversion Receiver for UHF RFID Readers, PrimeAsia 2009, pp. 109 - 112, 2009.

[9] Qiuling Zhu,Chun Zhang,Zhongqi Liu,Jingchao Wang,Fule Li,Zhihua Wang, A Robust Radio Frequency Identification System Enhanced with Spread Spectrum Technique, ISCAS 2009, pp. 37 - 40, 2009.

[10] Jingchao Wang,Chun Zhang,Baoyong Chi,Ziqiang Wang,Zhihua Wang, A Fully Integrated CMOS UHF RFID Reader Transceiver for Handheld Applications, CICC 2009, pp. 495 - 498, 2009.

[11] Jingchao Wang,Chun Zhang,Baoyong Chi,Zhihua Wang, Analysis and Design of a Fully Integrated SoC for UHF RFID Reader in CMOS Technology, ASICON 2009, pp. 415 - 418, 2009.

[12] Xi Lin,Jingchao Wang,Chun Zhang, Design of an UHF RFID Interrogator Based on ISO/IEC 18000-6C, Semiconductor Technology, Vol.33, No.9, pp. 817 - 820, 2008.

[13] Ni Chen,Chun Zhang,Jingchao Wang, Design of an UHF RFID Interrogator Baseband Processor, Semiconductor Technology, Vol.34, No.4, pp. 370 - 374, 2008.

[14] Min Li,Jingchao Wang,Chun Zhang,Yongmin Li,Zhihua Wang, The Application of Spread Spectrum Technique Communication in Radio Frequency Identi-fication System, Microcomputer Information, Vol.24, No.4-2, pp. 209 - 211, 2008.

[15] Haifeng Wang,Jingchao Wang,Chun Zhang,Zhihua Wang, Design of an UHF RFID Interrogator, Microcomputer Information, Vol.24, No.3-2, pp. 233 - 235, 221, 2008.

[16] Tianbao Gao,Jingchao Wang,Chun Zhang,Yongmin Li,Zhihua Wang, Design of a modulator and demodulator for UHF RFID readers, Chinese Journal of Semiconductors, Vol.29, No.7, pp. 1403 - 1406, 2008.

[17] Tianbao Gao,Jingchao Wang,Chun Zhang,Yongmin Li,Zhihua Wang, Design and realization of a portable RFID reader, Application of Electronic Technique, Vol.34, No.5, pp. 56 - 58, 2008.

[18] Jingchao Wang,Baoyong Chi,Xuguang Sun,Tongqiang Gao,Chun Zhang,Zhihua Wang, System design considerations of highly-integrated UHF RFID reader transceiver RF front-end, ICSICT 2008, pp. 1560 - 1563, 2008.

[19] Tongqiang Gao,Chun Zhang,Jingchao Wang,Baoyong Chi,Zhihua Wang, Design consideration of an multimode, power-controllable transmitter for UHF mobile RFID reader, ICCS 2008, pp. 484 - 1488, 2008.

[20] Jingchao Wang,Chun Zhang,Yongming Li,Zhihua Wang, The application of real-time spectrum analysis in radio frequency identification technique, Journal of Circuits and Systems, Vol.12, No.2, pp. 124 - 126, 2007.

[21] Tongqiang Gao,Baoyong Chi,Jingchao Wang,Changming Ma,Chun Zhang,Zhihua Wang, Application of CMOS Power Amplifiers in RFID Technology: An Overview, Microelectronics, Vol.36, No.4, pp. 450 - 455, 2006.