• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.11
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• pp.44-49
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• 2008

We have proposed a clock recovery circuit for 13.56MHz RFID Tags using 100%, ASK RF input signal. The proposed clock recovery circuit generates clock pulses without reference clock by adapting register controlled DLL. The proposed circuit have designed by using a TSMC 0.18um 1P6M CMOS technology. The simulated results show that the phase locking time of the proposed circuit is about 6.4 usec and power consumption is about 43uW at supply voltage of 3.3V.

• Electronics and Telecommunications Trends
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• v.21 no.2 s.98
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• pp.161-169
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• 2006

IT 839 정책 중 하나인 RFID는 기업의 수요 예측, 생산, 재고, 유통의 관리, 상점에서의 제품 판매 방식을 변화시킨다는 비전을 제시하고 있다. 향후 그 시장 규모가 막대할것으로 전망되고 있다. 본 고에서는 IDTech사의 RFID 구축사례에 대한 심층분석을 통해 현재 실제 시장 현황을 살펴보았다. IDTech사의 RFID 구축 데이터베이스에 의해, RFID 구축사례가 가장 많은 국가는 미국으로 나와 있으며, 전세계적으로 RFID가 가장많이 적용 되 어진 분야는 소매 및 소비재 분야로 나타났다. 가장 많이 사용 되 어지는 주파수 대역은 HF(13.56MHz)였다. 태그의 형태로는 라벨이 가장 많은 비중을 차지하는것으로 나타났다. HF(13.56MHz)와 LF(125~135kHz) 방식은 모든 국가에서 활용되고 있으나 Microwave(2.45GHz)와 UHF(868~960MHz)의 비중도 상대적으로 높게나타났다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.842-845
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• 2008

This paper propose a dormitory management system based on 13.56MHz RFID system. The proposed dormitory management system consists of three parts, the RFID hardware system the middleware, and the application. RFID hardware system uses 13.56MHz frequency which is suitable for a close range. The middleware is implemented to accept the RFID hardware system values using RS-232c communication method and forward the values to the application. The application is designed to make the DB using the forwarded values, and works based on the DB. The efficacy of the proposed dormitory management system is verified by means of experiments. In the experiments, we set up the system to the dormitory of Daeduk College to show the improvement results of proposed system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.232-234
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• 2018

In this study, We developed the non-contact RFID smart tag system. which are consists of passive RFID Tag and Reader. The system was designed for the low frequency of 13.56Mhz-band. The developed RFID smart tag board was developed to improve response time through simulation experiments were conducted. We introduced in the body of an RFID tag technology, circuit design and simulation and experimental results are described.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.47 no.3
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• pp.28-34
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• 2010

In this paper, the transceiver for RFID reader using 13.56MHz as a carrier frequency and meeting International Standard ISO 14443 type A, 14443 type B and 15693 is presented. The receiver is composed of envelope detector, VGA(Variable Gain Amplifier), filter, comparator to recovery the received signal. The proposed automatic reference voltage generator, positive peak detector, negative peak detector, and data slicer circuit can adjust the decision level of reference voltage over the received signal amplitudes. The transmitter is designed to drive high voltage and current to meet the 15693 specification. By using inductor loading circuit which can swing more than power supply and drive large current even under low impedance condition, it can control modulation rate from 30 percent to 5 percent, 100 perccnt and drive the output currents from 5 mA to 240 mA depending on standards. The 13.56 MHZ RFID reader is implemented in $0.18\;{\mu}m$ CM08 technology at 3.3V single supply. The chip area excluding pads is $1.5mm\;{\times}\;1.5mm$.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3145-3147
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• 2000

A passive RFID system consists of reader and tag. Reader is required the filter to modulate the data from backscattering signal which is transmitted by tag. The filter in the reader consists of envelope detector, amplifier, filter, and pulse shaping circuit, In this paper, design and analysis of filter in the RFID system which is operated at l3.56MHz carrier and 70KHz backscattering signal frequency is presented and is confirmed by simulation using Pspice.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.10
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• pp.932-935
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• 2015

This paper proposes a rectifier using bootstrapping and active body biasing in $0.11{\mu}m$ RF CMOS process. The proposed rectifier employs the full-wave rectifying structure with cross coupling and increases the power conversion efficiency by reducing the threshold voltage and leakage current using bootstrapping and active bias biasing. Also, it has been designed to be applied to a wide range of applications from 13.56 MHz used in wireless power transmission to 915 MHz used in RFID. As a measured result, 80 % of power conversion efficiency is obtained when the input power is 0 dBm at $10k{\Omega}$ load resistance and 13.56 MHz. Also 40 % of power conversion efficiency is shown in 915 MHz.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.487-489
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• 2005

국내에서도 RFID(Radio Frequency IDentification) 기술 및 응용 분야가 확대되고 있어 이의 조기 구축을 통한 관련 기술 발전 핀 세계 시장 진출의 기회 확보를 위해 국제 표준에 부합하는 RFID용 주파수 할당 및 관련 기술기준 제반 규정을 정비할 필요성이 대두되었고 이에 2004년 5월 900MHz RFID용 주파수를 결정하였으며, 13.56MHz대와 2.45GHz RFID에 대한 기술 기준이 제정되어 있다. 그러나 새로운 기술 발전 및 응용에 부합되도록 시급히 개정되어야 하여 세계적으로 대두되고 있는 UHF대 RFID에 대한 기술 기준 제정도 국내외 시장의 관점에서 시급히 이루어져야 한다. 국내 RFID산업이 향후 IT분야를 선도할 가장 중요한 산업중의 하나로 인식되어 정부와 산업계가 모두 RFID기술개발을 추진하고 있는 시점에서 국내 기술기준안물 분석하고 기술기준 제정방향을 제안함으로써 가용한 주파수스펙트럼을 효율적으로 사용하고, 보다 빨리 상용화를 실현함으로써 RFID관련 초기 시장형성 및 활성화를 기대할 수 있다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.257-257
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• 2006

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.3
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• pp.469-474
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• 2009

An RFID system consists of radio frequency tags attached to objects that need to be identified and one or more electromagnetic readers. Unlike the traditional bar code system, the great benefit of RFID technology is that it allows information to be read without requiring contact between the tag and the reader. For this contact-less feature, RFID technology in the near future will become an attractive alternative to bar code in many application fields. In almost all the 13.56MHz RFID systems, FSA algorithm is used for identifying multiple tags in the reader's identification range. In FSA algorithm, the tag identification time and system efficiency depend mainly on the number of tags and frame size. In this paper, we propose a tag number estimation scheme and a dynamic frame size allocation scheme based on the estimated number of tags.