基于电磁带隙结构的CCD相机成像电路降噪  

Noise Suppression in CCD Camera Imaging Circuits Using Electromagnetic Band-gap Structure

作　　者：申才立 陈瑞明[1] 王栋[1] 苏浩航[1] 韩志学[1] 

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2015年第5期44-50,共7页Spacecraft Recovery & Remote Sensing

摘　　要：文章研究了几种不同形式的电磁带隙（electromagnetic band-gap,EBG）结构,并分析了平面EBG结构的等效电路,提出一种适用于高速模数混合电路的平面EBG结构,可有效抑制电路中的同步开关噪声。使用ANSYS HFSS仿真软件对该EBG结构的频域特性进行了分析,结果显示：当抑制深度为–30d B时,阻带范围为0.7~2.3GHz和3.0--10GHz。相对于传统EBG结构,其阻带带宽由7GHz增加到8.6GHz。文章根据一款实用的CCD相机成像电路的PCB尺寸、噪声干扰源和敏感端的位置布局等信息,对其进行仿真分析,发现在使用改型EBG结构时,电路中的同步开关噪声得到一定抑制,为EBG结构在CCD相机成像电路中的应用提供了参考。By study of different structures of electromagnetic band-gap（EBG）and analysis of equivalent circuits of several planar EBG structures, a novel planar EBG structure is proposed for simultaneous switching noise（SSN）suppression in high speed mixed-signal processing circuits.With simulations of the EBG structure in frequency domain by ANSYS HFSS, the results show that a suppression depth of –30d B and two stop-bands of 0.7~2.3GHz and 3~10 GHz are obtained. Compared with traditional EBG structures, the total stop-band bandwidth increases from 7GHz to 8.6GHz, rising by 20%. Furthermore, based on size of a practical PCB in CCD camera imaging circuits and the position of interference sources and sensitive ends, the PCB with novel planar EBG structure has a better SSN suppression performance in high speed circuits through comparative simulation and analysis. This lays a foundation for using EBG structure in practical circuits.

关 键 词：电荷耦合器件 成像电路 同步开关噪声 电磁带隙 空间相机 

分 类 号：TN402[电子电信—微电子学与固体电子学]