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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 26(1), ISSN (Print)ISSN X (Online) 900 MHz RFID A 900 MHz RFID Receiver with an Integrated Digital Data Slicer 조영아 김동현 김남형 이재성 Younga ChoDong-Hyun KimNamhyung KimJae-Sung Rieh 요약 0.11μm CMOS 900 MHz RFID. RFID, D-,, RFID MHz, 5 μw, 325 μm 290 μm. Abstract In this paper, a receiver has been developed in a 0.11-μm CMOS technology for 900 MHz RFID communication system applications. The receiver is composed of an envelope detector, a low-pass-filter, a comparator, D flip-flops, as well as an oscillator to provide the clock for digital blocks. The receiver is designed for low power consumption, which would be suitable for passive RFID tags. In this circuit, a digital data slicer was employed instead of the conventional analog data slicer in order to reduce the power consumption. The clock frequency is 1.68 MHz and the circuit operates with a power consumption as small as 5 μw. The chip size is 325 μm 290 μm excluding the probing pads. Key words: RFID Tag, 900 MHz, Receiver, Digital Data Slicer. 서론 RFID (Radio Frequency Identification) [1]. RFID,., [2].,, [3]. RFID,,.,., RFID,, 2011 () (No ). (School of Electrical Engineering, Korea University) Manuscript received October 22, 2014 ; Revised December 12, 2014 ; Accepted December 22, (ID No S) Corresponding Author: Jae-Sung Rieh ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 63

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 1, Jan [4]. RFID LF, HF, UHF.,., UHF 900 MHz RFID,. 900 MHz RFID RFID μm CMOS 900 MHz RFID.. 회로설계 900 MHz RFID 1., D-,. RF.. D-,.. RFID. 그림 2. Fig. 2. Envelope detector circuit. RF 포락선검출기 RFID 2. RF, MOS -., (Flicker noise) PMOS. 900 MHz (carrier).., 2 3.,. cos (1) 그림 1. Fig. 1. Block diagram of receiver., 64

3 900 MHz RFID (2).,, RF., 4. 그림 3. Fig. 3. Equivalent circuit of envelope detector. (3), RFID RF 20 dbm., 1.3 V, (3) piecewise linear. (4), 그림 4. - Fig. 4. I-V curve of transistor in envelope detector., (2). (5) sin (6) (6),. cos sin (7) 그림 5. Fig. 5. Operation of envelop detector. (7) (8). (8). 65

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 1, Jan cos sin cos (8) (9) 디지털데이터슬라이서 D , , 0 1 ( 7. V COMP ). 1/2. 1/3, D- ( 7. V OUT ).,., RFID,,, RFID.. 2 그림 6. Fig. 6. Schematic of the digital data slicer. 그림 7. Fig. 7. The graph of the digital data slicer operation. 그림 8. Fig. 8. Schematic of the analog data slicer. 66

5 900 MHz RFID Power consumption (uw) P(analog) P(digital) Frequency (MHz) 그림 9. Fig. 9. A power consumption trend of analog data slicer and digital data slicer to follow operation frequencies., ,,.,,,. 9., 9. 9,,.,.. RFID,., 1 RFID,. 2-3 발진기 3, 10. RFID. MOS (source degeneration)., 표 1. RFID Table 1. Comparison with other RFID receiver. RFID carrier Data rate V DD 900 MHz 100 kbps 1.68 MHz 0.11 CMOS ASK 1 V 5 μw (simulation) [7] MHz 106 kbps CMOS BPSK μw [8] 900 MHz 150 kbps CMOS ASK 1.5 V 14 μw [9] 869 MHz, 2.45 GHz - - CMOS ASK, PSK 1.5 V 16.7 μw 67

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 1, Jan 그림 10. Fig. 10. Oscillator circuit. 그림 11. (D IN, D IN_B) Fig. 11. Final output signal of receiver(d IN, D IN_B ). RFID, 1/ MHz ±25 %.. 측정결과, RFID.. RFID 100 khz 900 MHz ,. 12, 1.68 MHz., 1/3 (CK D_B ) (CK B) 12. RFID. 그림 12. (CK B, C KD_B ) Fig. 12. Output signal of oscillator(ck B, C KD_B). 그림 13. RFID Fig. 13. Chip photo of fabricated RFID receiver. 68

7 900 MHz RFID 1 V V DD, 5 μw.., 325 μm 290 μ m, 13.. 결론 0.11 μm CMOS 900 MHz RFID. RFID.., 100 kbps 3.4 %. RFID. 900 MHz RFID. References [1] Medeiros et al., "Passive UHF RFID tag for airport suitcase tracking and identification", in Antennas and Wireless Propagation Letters, vol. 10, pp , Mar [2],,, "UHF RFID ",, 22(4), pp , Apr [3] K. Finkenzeller, RFID Handbook, Second Edition, John Wiley & Sons, [4] Anastasis C. Plycarpou, George Gregoriou, Loizos Papaloziou, and etc., "A healthcare application based on passive UHF RFID technology", Proceedings of the 5th European Conference on Antennas and Propagation (EU- CAP), pp , Apr [5] Kang, Leblebici, CMOS Digital Integrated Circuits Analysis and Design, Third Edition, McGraw Hill, [6] Ali Beirami, Mohammad Takhi, and Hossein Shamsi, "Extracting trade-off boundaries of CMOS two-stage opamp using particle swarm optimization", International Symposium on Signal, Circuits and Systems, pp.1-4, Jul [7] Jong-Wook Lee, Duong Huynh Thai Vo, Quoc-Hung Huynh, and Sang Hoon Hong, "A fully integrated HFband passive RFID tag IC using 0.18-um CMOS technology for low-cost security applications", IEEE Transactions on Industrial Electronics, vol. 58, no. 6, Jun [8] Jong-Wook Lee, Bomson Lee, "A long-range UHF-band passive RFID tag IC based on high-q design approach", IEEE Transaction on Industrial Electronics, vol. 56, no. 7, Jul [9] Udo Karthaus, Martin Fischer, "Fully integrated passive UHF RFID transponder IC with 16.7-uW minimum RF input power", IEEE Journal of Solid-state Circuits, vol. 38, no. 10, Oct

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 1, Jan 조영 아 년 2월: 숭실대학교 정보통신전자공 학과 (공학사) 2013년 3월 현재: 고려대학교 전기전자 공학과 석사과정 [주 관심분야] RFID, RF 및 아날로그 집 적회로 김남 형 2013 김동 현 년 2월: 고려대학교 전기전자전파공 학부 (공학사) 2010년 8월: 고려대학교 전기전자공학과 (공학석사) 2010년 8월 현재: 고려대학교 전기전자 공학과 박사과정 [주 관심분야] RF/아날로그 회로 및 시스 2008 템 70 년 2월: 고려대학교 전기전자전파공 학부 (공학사) 2008년 8월 현재: 고려대학교 전기전자 공학과 석박사 통합과정 [주 관심분야] 밀리미터파 발진기 및 위 상동기루프 시스템 2008 이재 성 년 2월: 서울대학교 전기전자공학부 공학사) 년 2월: 서울대학교 전기전자공학과 공학석사) 년 11월: Univ. of Michigan EECS (공 학박사) 1999년 204년: IBM Semiconductor R&D Center 2004년 현재: 고려대학교 전기전자전파공학부 정교수 [주 관심분야] 밀리미터파 소자 및 회로, THz 1991 ( 1995 ( 1999

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