基于AS3992芯片的远距离RFID读写器设计  

Design of long-range RFID reader based on AS3992 chip

作　　者：许煜[1] 闻扬[1] 戴锡春 

机构地区：[1]上海宝信软件股份有限公司机电成套事业本部,上海201203

出　　处：《微型机与应用》2012年第18期32-34,共3页Microcomputer & Its Applications

摘　　要：介绍了一种基于AS3992芯片的远距离RFID读写器设计。通过AS3992内部集成的模拟前端和协议处理系统,配合基带的MCU控制,实现了在通信频率840MHz^960MHz内发射功率可调、天线接口可切换等实用功能。为了达到更远的传输距离,使用了多种阻抗匹配网络对微带线阻抗进行微调,且对输出功率加以检测,有效防止了盲目增大发射功率导致接收干扰而影响识别距离的问题。设计了4个天线接口,扩展了读写器的应用距离,同时减少了单天线的盲区,降低了误码率。A long-range RFID reader based on AS3992 chip is introduced, which has integrated analog front-end and protocol processing system. By means of the MCU controling,this design realizes the practical functions of adjustable transmit power and antenna port switching in the communication frequency 840 MHz-960 MHz. In order to achieve longer transmission distance, a variety of impedance matching networks are used to fine-tune the impedance of the mierostrip line and detect the output power to be effective to prevent blindly increasing the transmission power in order to avoid the problem of interference in the identification distance. In addition, four antenna interface is designed to extend the reader＇s distance and reduce the blind spots so that to reduce the error rate.

关 键 词：UHF RFID AS3992 载波 功率放大器 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]