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A NEW LOW-COST demodulator FOR 2.4 GHZ ZIGBEE RECEIVERS

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Journal of Electronics(China) 2009年第2期26卷 252-257页

作者： Yu Yunfeng Meng Xin Xiao Shimao Ma Chengyan Ye Tianchun Institute of Microelectronics of Chinese Academy of Sciences（CAS） Beijing 100029 China Hangzhou Microelectronics of Chinese Academy of Science Ltd. Hangzhou 310053 China

A new low-cost demodulator for ZigBee receivers satisfying requirements of IEEE802.15.4 standard is presented,which is designed for ISM 2.4 GHz band and based on Zero-IF *** demodulator extracts symbols directly from baseband signal rather than recovering PN code chips,so its structure is *** main techniques are used to improve the performance of *** is Phase-Axis Crossing Detector(PACD) which detects the phase correlation of baseband *** other is symbol synchronization and sampling clock correction *** result shows that this demodulator performance,Symbol Error Rate(SER) and Packet Error Rate(PER) meet IEEE 802.15.4TM standard requirements and the demodulator can handle frequency offset in excess of 200 kHz,involving a Zero-IF receiver with a Noise Figure(NF) lower than 17 dB,which is easily imple-mented in standard CMOS technology.

关键词： ZigBee demodulator Minimum Shift Keying(MSK) Low-cost Symbol synchronization

A wideband frequency-shift keying demodulator for wireless neural stimulation microsystems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第6期7卷 1056-1060页

作者： DONG Mian ZHANG Chun MAI Song-ping WANG Zhi-hua LI Dong-mei Department of Electronic Engineering Tsinghua University Beijing 100084 China Institute of Microelectronics Tsinghua University Beijing 100084 China

This paper presents a wideband frequency-shift keying （FSK） demodulator suitable for a digital data transmission chain of wireless neural stimulation microsystems such as cochlear implants and retinal prostheses. The demodulator circuit derives a constant frequency clock directly from an FSK carrier, and uses this clock to sample the data bits. The circuit occupies 0.03 mm^2 using a 0.6 μm, 2M/2P, standard CMOS process, and consumes 0.25 mW at 5 V. This circuit was experimentally tested at transmission speed of up to 2.5 Mbps while receiving a 5-10 MHz FSK carrier signal in a cochlear implant system.

关键词： Biomedical implants CMOS demodulator Frequency-shift keying (FSK) Cochlear implant

A passive UHF RFID tag with a dynamic-V_(th)-cancellation rectifier

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Journal of Semiconductors 2013年第9期34卷 117-121页

作者：沈劲鹏汪波刘珊王新安阮正坤李守成 The Key Laboratory of Integrated Microsystems Peking University Shenzhen Graduate School

This paper presents a passive UHF RFID tag with a dynamicVthcancellation （DVC） rectifier. In the rectifier, the threshold voltages of MOSFETs are cancelled by applying gate bias voltages, which are dynamically changed according to the states of the MOSFETs. The DVC rectifier enables both low ONresistance and small re verse leakage of the MOSFETs, resulting in high power conversion efficiency （PCE）. An areaefficient demodulator with a novel average detector is also designed, which takes advantage of the rectifier＇s first stage as the envelope detector. The whole tag chip is implemented in a 0.18 μm CMOS process with a die size of 880 x 950μm2. Measurement results show that the rectifier achieves a maximum PCE of 53.7% with 80 kΩ resistor load.

关键词： UHF RFID tag rectifier demodulator PCE

A Novel Digital Transceiver for CT0 Standard

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Journal of Semiconductors 2007年第6期28卷 833-841页

作者：陈殿玉许长喜陈浩琼李振郭秀丽惠志强施鹏王跃吴岳熊绍珍南开大学光电子研究所天津300071 南开大学微电子学系天津300071 南开大学通信工程系天津300071

This paper introduces a novel digital transceiver for the cordless telephone zero （CT0） standard,which uses a digital modulation and demodulation technique to handle the signal instead of the traditional analog meth-od. In the transmitter,a fractional-N phase locked loop （PLL） is utilized to realize the continuous phase frequency shift key （CPFSK） modulation,and a 2 Ts raised cosine （2RC） shaping technique is used to reduce the occupied bandwidth. In the receiver,a novel digital method is proposed to demodulate the 2RC CPFSK signal. This chip is fabricated using an SMIC 0.35μm mixed signal CMOS process with a die size of 2mm × 2mm. With an external low noise amplifier （LNA）,the sensitivity of the chip is better than -103dBm.

关键词： RF transceiver fractional-N PLL CPFSK modulator demodulator

Design and Implementation of Remotely Controlled Vehicle Anti-Theft System via GSM Network

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Wireless Sensor Network 2013年第8期5卷 151-157页

作者： T. T. Oladimeji P. O. Oshevire O. O. Omitola O. E. Adedokun Department of Computer Engineering Afe Babalola University Ado-Ekiti Nigeria Department of Electrical/Electronics Engineering Afe Babalola University Ado-Ekiti Nigeria Federal Ministry of Communication Abuja Nigeria

The purpose of this paper is to build a secured and reliable vehicle anti-theft system which will have the ability to access the vehicle subsystems from a remote location where there is GSM network. And also, the design method involves the interfacing of GSM/GPRS modem module with the vehicle ignition subsystem, and the test result shows that it performs some control actions on the vehicle subsystems from a mobile phone, having taken the advantage of the wide coverage area of some GSM networks. Hence the topic is “Remotely Controlled Vehicle Anti-theft System via GSM Network”.

关键词： CODEC—Coder and Decoder GSM—Global System for Mobile Telecommunication GPRS—General Packet Radio Service MODEM—Modulator and demodulator SMS—Short Messaging Service