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International Conference on asic

作者： Zhiheng Lin Xi Tan Hao Min ASIC & System State Key Laboratory AUTO-ID Laboratory of Fudan University Shanghai China

A CMOS passive mixer-first receiver front-end for UHF RFid Reader is presented in this paper. Instead of LNA input structure, we choose single-balanced passive mixer as the input stage to improve compression point, and can handle the large jammer noise from the leakage of the transmitter. The transimpedance amplifiers are followed by the mixers to provide enough gain and suppress the noise behind. We also use complex impedance match at baseband to control the real and imaginary part of the antenna equivalent impedance. This can leave out the matching network off chip. The receiver front-end circuit is designed in SMIC 0.13μm CMOS process.

关键词： Mixers Baseband Receivers Radiofrequency identification Impedance Noise Impedance matching

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An NFC system with high sensitivity based on SDR

An NFC system with high sensitivity based on SDR

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International Conference on asic

作者： Longxiang Zhang Hantian Xu Yingbo Dai Hao Min ASIC & System State Key Laboratory AUTO-ID Laboratory of Fudan University Shanghai China

This paper presents a high-sensitivity NFC system based on labview platform using SDR (Software Defined Radio) approach. Protocol ISO14443-A is used in this work. This paper analyses the entire transceiver system and sensitivity of the system. Test results show that the receiver reaches the sensitivity of -80 dBm and maximum reading distance of 24 cm.

关键词： Finite impulse response filters Sensitivity Baseband Noise Receivers Bit error rate Radiofrequency identification

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Frame synchronization for a narrow-band power line OFDM communication system

Frame synchronization for a narrow-band power line OFDM comm...

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International Conference on asic

作者： Xiaoxue Yu Hong Liu Hao Min ASIC & System State Key Laboratory AUTO-ID Laboratory of Fudan University Shanghai China

In this paper, a method of frame synchronization for narrow-band power line communication (PLC) system employing orthogonal frequency division multiplexing (OFDM) technique is presented. For PLC channel is affected by frequency-selective fading and narrow-band interference problems, frame synchronization can't be achieved by doing correlation between received signal and known data. Instead a special synchronization symbol and proper algorithm are needed so that receiver can start its FFT at the right time. The algorithm is verified in real power line noise and multipath channels, and the performance is evaluated in terms of BER in MATlab environment.

关键词： OFDM Synchronization Training Noise Signal processing algorithms

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Analysis and design of power efficient semi-passive RFid tag

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Journal of Semiconductors 2010年第7期31卷 144-150页

作者：车文毅关硕王肖熊廷文奚经天谈熙闫娜闵昊 State Key Laboratory of ASIC and System Auto-ID LaboratoryFudan University

The analysis and design of a semi-passive radio frequency identification（RFid） tag is *** studying the power transmission link of the backscatter RFid system and exploiting a power conversion efficiency model for a multi-stage AC-DC charge pump,the calculation method for semi-passive tag＇s read range is *** to different read range limitation factors,an intuitive way to define the specifications of tag＇s power budget and backscatter modulation index is given.A test chip is implemented in SMIC 0.18μm standard CMOS technology under the guidance of theoretical *** main building blocks are the threshold compensated charge pump and low power wake-up circuit using the power triggering wake-up *** proposed semi-passive tag is fully compatible to EPC C1G2 *** has a compact chip size of 0.54 mm^2,and is adaptable to batteries with a 1.2 to 2.4 V output voltage.

关键词： RFid semi-passive tag power conversion efficiency AC-DC charge pump wake-up circuit

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Low-cost low-power UHF RFid tag with on-chip antenna

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Journal of Semiconductors 2009年第7期30卷 137-142页

作者：奚经天闫娜车文毅徐琮辉王肖杨玉庆菅洪彦闵昊 State Key Laboratory of ASIC & System Auto-ID Laboratory Fudan University

This paper presents an EPC Class 1 Generation 2 compatible tag with on-chip antenna implemented in the SMIC 0.18 μm standard CMOS *** UHF tag chip includes an RF/analog front-end, a digital baseband, and a 640-bit EEPROM *** on-chip antenna is optimized based on a novel parasitic-aware *** rectifier is optimized to achieve a power conversion efficiency up to 40% by applying a self-bias feedback and threshold compensation techniques.A good match between the tag circuits and the on-chip antenna is realized by adjusting the rectifier input *** show that the presented tag can achieve a communication range of 1 cm with 1 W reader output power using a 1 × 1 cm2 single-turn loop reader antenna.

关键词： RFid tag on-chip antenna rectifier low-cost low-power

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Physical modeling of on-chip antenna for UHF RFid tags

Physical modeling of on-chip antenna for UHF RFID tags

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Antennas and Propagation Society International Symposium

作者： Jingtian Xi Hao Min Terry T. Ye State Key Laboratory of ASIC & System Auto-ID Laboratory Fudan University Shanghai China Logistics and Supply Chain Management (LSCM) Hong Kong Research and Development Center Hong Kong China

ISBN: (纸本)9781424449675

Lumped-element models and parameter extraction methods for OCA are vital to successfully integrating OCA with RFid tags. In this paper, a compact model for OCA at UHF band is proposed. Metal loss (skin and proximity effects) and substrate coupling are taken into account. Meantime, a fast and physics meaningful parameter extraction method is presented. Two OCA prototypes and one fully-integrated UHF RFid tag chip have been designed and fabricated in SMIC 0.18μm CMOS RF process. Their measurement and simulation results verified the proposed OCA model and parameter extraction method. It is further demonstrated that the proposed model and extraction method can help to predict the tag read range.

关键词： Integrated circuit modeling Semiconductor device modeling Substrates Antennas Parameter extraction Mathematical model Radiofrequency identification

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A 4.2-5GHz,low phase noise LC-VCO with constant bandwidth and small tuning gain

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Journal of Semiconductors 2009年第9期30卷 62-65页

作者：徐琮辉奚经天卢磊杨玉庆谈煕闫娜闵昊 Auto-ID Laboratory State Key Laboratory of ASIC & SystemFudan University

As the tuning frequency of an integrated LC-voltage controlled oscillator （LC-VCO） increases, it is difficult to co-design the active negative resistance core and the varactor to achieve wideband frequency range, low phase noise, constant bandwidth and small tuning gain together. The presented VCO solves the problem by designing a set of changeable varactor units. The whole VCO was implemented in a 0.18μm CMOS process. The measured result shows -120 dBc/Hz phase noise at 1 MHz offset. The measured tuning range is from 4.2 to 5 GHz and the tuning gain is 8-10 MHz/V. The VCO draws 4 mA from a 1.5 V supply voltage.

关键词： VCO low phase noise switched varactor array tuning gain constant bandwidth

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A memory-efficient LUT-based AM/AM digital predistortor for UHF RFid reader

A memory-efficient LUT-based AM/AM digital predistortor for ...

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International Conference on asic

作者： Yuqing Yang Zongming Liu Xi Tan Hao Min State key lab of ASIC and System Auto-id lab at Fudan University Shanghai P.R. China

Digital predistortion is one of the most successful approaches to linearize a nonlinear power amplifier. However in most lookup-table (LUT) based digital predistorters, memories are not efficiently used because they are uniformly spaced. In this paper, a simple but effective method is proposed to make the LUT size significantly reduced. This method applies A-law companding to space the table and linear interpolation technique to reconstruct the predistorted output. Implementation and verification of a memory-efficient AM/AM digital predistorter for UHF RFid reader transmitter is also given in this paper.

关键词： Radiofrequency identification Table lookup Power system modeling Predistortion Power amplifiers Amplitude modulation Solid modeling Interpolation Degradation Costs

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A 1.04 µW Truly Random Number Generator for Gen2 RFid tag

A 1.04 µW Truly Random Number Generator for Gen2 RFID tag

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IEEE Asian Conference on Solid-state Circuits (ASSCC)

作者： Wei Chen Wenyi Che Zhongyu Bi Jing Wang Na Yan Xi Tan Junyu Wang Hao Min Jie Tan State Key Lab of ASIC and System Auto ID Laboratory Fudan University Shanghai China Institute of Automation Chinese Academy and Sciences Beijing China

This paper proposes a low power, low voltage Truly Random Number Generator (TRNG) for EPC Gen2 RFid tag. According to the special requirements of Gen2 tag, design considerations and tradeoffs among chip area, power consumption and randomicity are presented. The proposed TRNG is composed of an analog random seed generator which uses the oscillator sampling mechanism, and Linear Feedback Shift Registers (LFSR) for post digital processing. Realized in SMIC 0.18 μm standard CMOS process, the TRNG generates 16-bit random series at a speed of 40 kb/s, and their randomicity performance is verified by the FIPS 140-2 standard for security. Power consumption of the TRNG is only 1.04 μW with a minimum supply voltage of 0.8 V, and its total chip area is 0.05 mm 2 .

关键词： Random number generation RFid tags Oscillators Radiofrequency identification Circuits Energy consumption Cryptography Communication system security Broadband amplifiers Frequency

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A two-stage wake-up circuit for semi-passive RFid tag

A two-stage wake-up circuit for semi-passive RFID tag

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International Conference on asic

作者： Wei Chen Wenyi Che Xiao Wang Chenling Huang Na Yan Hao Min Jie Tan State Key Laboratory of ASIC and System Auto id Lab Fudan University Shanghai China Institute of Automation Chinese Academy and Sciences Beijing China

A two-stage wake-up circuit for semi-passive radio frequency identification (RFid) tag is designed and implemented in SMIC 0.18 ¿m CMOS technology. In order to prolong the tag's battery life, a novel two-stage wake-up strategy with self-calibration is proposed. Measurement results show that the wake-up circuit has no static power and is free of process, voltage and temperature (PVT) variations.

关键词： Circuits RFid tags Radiofrequency identification Batteries Threshold voltage CMOS technology Logistics Costs Rectifiers Inverters

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