应用于5.8 GHz雷达传感器的中频信号滤波处理  

IF signal filtering processing for 5.8 GHz radar sensor

作　　者：董亚婷 陈磊 DONG Yating;CHEN Lei(College of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 201306,China)

机构地区：[1]上海电力大学电子与信息工程学院,上海201306

出　　处：《电子设计工程》2024年第19期62-66,共5页Electronic Design Engineering

摘　　要：针对5.8 GHz多普勒雷达传感器的应用需求,设计完成了雷达传感器的数字电路部分。整个数字电路分为两大部分功能,一是控制雷达传感器进入不同的工作模式,满足不同的功耗需求;二是对雷达传感器采样得到的中频信号进行滤波以及算法处理,使得能够在一定距离内感应人体移动。文中对其中的中频信号滤波处理展开详细论述,该部分采用陷波滤波器、低通滤波器、全通均衡器级联的IIR滤波结构,用较低的滤波器阶数实现了对工频干扰的46 dB衰减,在100 Hz处的衰减能够达到38 dB,并且通过全通均衡器对系统的群时延进行了一定的补偿。整个设计采用dongbu011rf工艺,在8 MHz和32 kHz的时钟频率约束下,版图面积约为475 200μm^(2),经流片测试,动态功耗约为0.41 mW,实现的功能与应用需求一致。Tomeet with the applicationof 5.8 GHz Doppler radar sensor,the digital circuit of the radar sensor is designed.The entire digital circuit is divided into two main functions:one is to control the radar sensor to work in different modes,in order to meet different power consumption requirements;the other is to filter and process the IF signal sampled by the radar sensor,so as to sense human movement within a certain distance.This article provides a detailed discussion on the filtering processing of IF signal.This part adopts a cascaded IIR filtering structure of notch filter,low-pass filter,and all-pass equalizer,achieving 46 dB attenuation for power-line interference and 38 dB attenuation for 100 Hz using a lower filter order.Additionally,the group delay of the system is compensated to a certain extent through an allpass equalizer.Adopting the dongbu011rf process,the layout area is approximately 475200μm2,under the clock frequency constraints of 8 MHz and 32 kHz.After chip testing,the dynamic power consumption is about 0.41 mW,and the implemented functions are consistent with the application requirements.

关 键 词：多普勒雷达 数字电路设计 陷波滤波器 群时延补偿 全通均衡器 

分 类 号：TN713[电子电信—电路与系统]