Design of 13.56MHz Radio Frequency Identification Transponder in Low Temperature Polysilicon Thin Film Transistor Technology
Date Issued
2010
Date
2010
Author(s)
Lee, Yuan-Jiang
Abstract
Since radio frequency identification (RFID) system has been commericalized in 1990s, it has had great impact on human daily life. Electronic article surveillance systems, electronic identification, electronic wallet, inventory management and automatic control systems, even the wireless bio-medical sensors (or capsules) are all belong to the category of RFID applications. Recently, RFID has been applied to consumer electronics or some other portable electonic devices such as cell phones.
Owing to the portable device with internal RFID function, it can become much easier to access digital information that has been loaded in the surrounding objects. For instance, Easy Card or building access identification can be embedded inside the cell phone or some information like pictures or prices of desired products can also be gotten by using customers‘ portable device with internal RFID function.
Currently, most RFID transponder (or tag) ICs are manufactured by CMOS process. Their costs are relative higher and they are not quite easy to integrate directly with products. All of these drawbacks are the critical limitation of CMOS RFID transponder on the implementation of RFID embedded device. Thanks to the rapid growth of display technology in recent year, electric characteristics of thin-film transistors (TFTs) in the low temperature polysilicon (LTPS) active matrix liquid crystal display (AMLCD) panel process has a great breakthrough. Then things become difference.
With comparing to the conventional α-Si process, the electron mobility of LTPS TFT device is over one hundred times larger than α-Si TFT. It gives rise the potential to integrate RFID transponder with any portable device with LTPS panel display or even becomes a single portable display device with wireless communication ability. A single
LTPS RFID transponder chip cost only 1% of CMOS RFID transponder. It not only dramatically reduces the cost for RFID system popularization but also gives rise to the predomination of LTPS panel over other panel displays.
In the first part of this thesis, the published RFID transponder among the journals and international conferences in recent twenty years are surveyed, discussed and organized. And then the second part is to introduce the basic principle of RFID system operation and ISO/IEC 14443 specification. The third part is about the investigation on the LTPS process, material physicals, device characteristics and recent development. How these factors affect LTPS circuit performance is also discussed in this part. Also, the LTPS TFTs DC and AC models are constructed.
The implementation an ultra-low cost, high integration and embeddable in panel display LTPS RFID transponder for ISO/IEC 14443 specification is stated in the fourth part. It focuses on low frequency and short distance applications such as Easy Card and building access control system. However, it lacks stable performance quality among each chip because conventional circuit architectures have been suffered a large amount of device/process variation due to LTPS TFT device mismatch. In order to overcome the device/process variation, brand new system and circuit architectures are developed. The innovative digital coding/decoding methods are proposed for reliable data transmission as well.
Subjects
Radio frequency identification(RFID)
Tag
Transponder
Tag on Glass(ToG)
ASK Demodulator
Clock Recovery
Load Modulator
LTPS
TFT
System on Panel (SoP)
System on Glass (SoG)
Type
thesis
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