Biography
Enrollment Date: 2006
Graduation Date：2009
Degree：M.S.
Defense Date：2009.12.21
Advisors：Chun Zhang
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：Design of the Crucial Circuits of RFID Transponder
Abstract:
RFID (Radio Frequency Identification), a contactless automatic identification technology, uses radio waves to identify individual items and collecting information in some tough conditions like long distance, mobile state, multi-tags con-existence, dust pollution and sight blocks. Due to its excellent good performance, RFID is now widely used in various identification, such as item identification, human identification, supply chain management, mobile payment, certificate anti-falsification and book management. Crucial circuits of RFID transponder are discussed in this paper.
In-depth tTheoretical analysis of the proposed DC-DC charge pump’s principle is provided and detailed working process of the circuit is given. In addition, the comparison between the proposed circuit and the other three traditional circuits, which includes voltage gain, transfer efficiency and output ripple, is demonstrated. The proposed circuit and the other three circuits are implemented in UMC 0.18µm standard CMOS technology and the Theoretical Analysis is verified.
In the designing of on-chip antenna, ‘adjusting HFSS input parameters’ is proposed to find accurate spiral inductor characteristic parameters. An on-chip antenna is implemented in UMC 0.18µm standard CMOS technology according to this method, whose characteristic parameters are in line with the HFSS simulation results. Also, coupling characteristics of coil is discussed and proved to be true by simulating of HFSS. Besides, two near-field reader antennas are designed and impedance matching is realized.
In the end, two oscillators used in tag are implemented in UMC 0.18µm standard CMOS technology and Fujitsu ferroelectric technology separately, which work normally as expected.