RFID系统中的低通滤波器设计  

Design of a Low-Pass Filter for RFID System

作　　者：惠欣[1] 陈晓哲[1,2] 樊晓华[1,2] 杨浩[1] 张海英[1] 

机构地区：[1]中国科学院微电子研究所射频集成电路实验室,北京100029 [2]南京中科微电子有限公司,南京210046

出　　处：《微电子学》2013年第5期620-623,627,共5页Microelectronics

基　　金：中国科学院院地合作专项(Y2YH01A001)

摘　　要：介绍了一种用于RFID系统的有源RC低通滤波器。该滤波器是一个6阶巴特沃斯型滤波器,包含三个级联的Tow-Thomas二次节。采用直流失调消除电路,有效地降低了直流失调;使用自动频率校准电路来消除温度、工艺和电压波动等对滤波器截止频率的影响。仿真结果显示,该滤波器电路的截止频率可达1.3 MHz,通带增益6dB,12dB,18dB,24dB可调,调谐精度为5%,线性度IIP3可达到17.6dBm。电路采用TSMC 0.18μm CMOS工艺实现,面积为0.6mm2,工作电压为1.8V,消耗电流3mA。An active-RC low-pass filter for RFID system was presented, which was a 6th-order Butterworth filter consisting of 3 serial Tow-Thomas hiquads. In this circuit, two DC-offset cancellation circuits were incorporated to effectively reduce DC offset, and an auto frequency tuning circuit was used to avoid effects of variations in process, voltage and temperature （PVT） on cut-off frequency. Simulation results showed that the filter had a cut-off frequency up to 1.3 MHz, an adjustable passband gain of 6 dB/12 dB/18 dB/24 dB, a frequency tuning error of 5%, and an IIP3 up to 17. 6 dBm. Fabricated in TSMC＇s 0. 18μm CMOS process, the circuit occupied a chip area of 0. 6 mm2 , and consumed 3 mA of current from 1.8 V supply.

关 键 词：无线射频识别 有源RC低通滤波器 直流失调消除 自动频率校准 

分 类 号：TN432[电子电信—微电子学与固体电子学]