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Circuit and Layout Design of Modem System of UHF Passive RFID Tag

Author: MaLiYuan
Tutor: MaoLuHong
School: Tianjin University
Course: Microelectronics and Solid State Electronics
Keywords: Radio Frequency Identification UHF passive tag chip Analog front-end Modem Amplitude Shift Keying
CLC: TP391.44
Type: Master's thesis
Year: 2008
Downloads: 300
Quote: 3
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In recent years , passive radio frequency identification technology has been widely used in a variety of areas of the circulation of commodities , manufacturing, goods and personnel tracking . Clearly , The cheap CMOS process will make the good performance of the RF band manifested UHF RFID revolutionary development in the field of supply chain management . With the advances in RFID technology and the development of CMOS process level , radio frequency identification technology in recent years has become a hot research topic . In this paper, the UHF passive RFID tag chip , given some of the key principles and design of the circuit . Start from the overall structure and working principle of UHF RFID tags , passive UHF RFID tags analog front-end circuit structure . This article focuses on UHF passive RFID tags analog front-end modem circuit , power-on reset (POR) and the study and design of the reference current source . Modulation and demodulation circuit This paper begins with the basic theoretical study start to study the ways and types of modulation and demodulation principle and method , given UHF RFID interface protocol , then these basic theories based on proposed modulation and demodulation circuit design. POR and the design of the reference current source , on the basis of previous studies , the design and circuit structure . Circuit simulation , and design the territory of each module as well as the analog front-end overall circuit layout . Circuit design and layout using SMIC 0.18μm CMOS process . The design of this article on the basis of previous studies , to be innovative in the circuit structure ; circuit performance , power consumption is optimized . The power-on reset circuit design to achieve zero power consumption ; design of the current reference source subthreshold reference current is only 100nA ; modulation and demodulation circuit the ASK way to make the circuit more versatility for different protocols ; solution modulation circuit to improve the circuit structure , so that the module and having a better suitability for changes in signal intensity and the depth of modulation .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Optical pattern recognition devices
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