黄金岛棋牌游戏下载

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        PCB走线宽度变化产生的反射

        时间:2016-11-30      浏览次数:

        在进行PCB布线黄金岛棋牌游戏下载时,经常会发生这样的情况:走线通过某一区域时,由于该区域布线空间有限,不得不使用更细的线条,通过这一区域后,线条再恢复原来的宽度。走线宽度变化会引起阻抗变化,因此发生反射,对信号产生影响。那么什么情况下可以忽略这一影响,又在什么情况下我们必须考虑它的影响?

        YOUSANGEYINSUHEZHEIYIYINGXIANGYOUGUAN:ZUKANGBIANHUADEDAXIAO、XINHAOSHANGSHENGSHIJIAN、ZHAIXIANTIAOSHANGXINHAODESHIYAN。

        黄金岛棋牌游戏下载SHOUXIANTAOLUNZUKANGBIANHUADEDAXIAO。HENDUODIANLUDESHEJIYAOQIUFANSHEZAOSHENGXIAOYUDIANYABAIFUDE5%(ZHEIHEXINHAOSHANGDEZAOSHENGYUSUANYOUGUAN),GENJUFANSHEXISHUGONGSHI:

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        黄金岛棋牌游戏下载YIJISUANCHUZUKANGDAZHIDEBIANHUALVYAOQIUWEI:

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        黄金岛棋牌游戏下载NIKENENGZHIDAO,DIANLUBANSHANGZUKANGDEDIANXINGZHIBIAOWEI+/-10%,GENBENYUANYINJIUZAIZHEI。

        RUGUOZUKANGBIANHUAZHIFASHENGYICI,LIRUXIANKUANCONG8milBIANDAO6milHOU,YIZHIBAOCHI6milKUANDUZHEIZHONGQINGKUANG,YAODADAOTUBIANCHUXINHAOFANSHEZAOSHENGBUCHAOGUODIANYABAIFUDE5%ZHEIYIZAOSHENGYUSUANYAOQIU,ZUKANGBIANHUABIXUXIAOYU10%。ZHEIYOUSHIHENNANZUODAO,YI FR4BANCAISHANGWEIDAIXIANDEQINGKUANGWEILI,WOMENJISUANYIXIA。RUGUOXIANKUAN8mil,XIANTIAOHECANKAOPINGMIANZHIJIANDEHOUDUWEI4mil,TEXINGZUKANGWEI46.5OUMU。XIANKUANBIANHUADAO6milHOUTEXINGZUKANGBIANCHENG54.2OUMU,ZUKANGBIANHUALVDADAOLE20%。FANSHEXINHAODEFUDUBIRANCHAOBIAO。ZHIYUDUIXINHAOZAOCHENGDUODAYINGXIANG,HAIHEXINHAOSHANGSHENGSHIJIANHEQUDONGDUANDAOFANSHEDIANCHUXINHAODESHIYANYOUGUAN。DANZHISHAOZHEISHIYIGEQIANZAIDEWENTIDIAN。XINGYUNDESHIZHEISHIKEYITONGGUOZUKANGPIPEIDUANJIEJIEJUEWENTI。

        RUGUOZUKANGBIANHUAFASHENGLIANGCI,LIRUXIANKUANCONG8milBIANDAO6milHOU,LACHU2cmHOUYOUBIANHUI8mil。NEIMEZAI2cmZHANG6milKUANXIANTIAODELIANGGEDUANDIANCHUDOUHUIFASHENGFANSHE,YICISHIZUKANGBIANDA,FASHENGZHENGFANSHE,JIEZHEZUKANGBIANXIAO,FASHENGFUFANSHE。RUGUOLIANGCIFANSHEJIANGESHIJIANZUGOUDUAN,LIANGCIFANSHEJIUYOUKENENGXIANGHUDIXIAO,CONGERJIANXIAOYINGXIANG。JIASHECHUANSHUXINHAOWEI1V,DIYICIZHENGFANSHEYOU0.2VBEIFANSHE,1.2VJIXUXIANGQIANCHUANSHU,DIERCIFANSHEYOU -0.2*1.2 = 0.24vBEIFANSHEHUI。ZAIJIASHE6milXIANZHANGDUJIDUAN,LIANGCIFANSHEJIHUTONGSHIFASHENG,NEIMEZONGDEFANSHEDIANYAZHIYOU0.04V,XIAOYU5%ZHEIYIZAOSHENGYUSUANYAOQIU。YINCI,ZHEIZHONGFANSHESHIFOUYINGXIANGXINHAO,YOUDUODAYINGXIANG,HEZUKANGBIANHUACHUDESHIYANYIJIXINHAOSHANGSHENGSHIJIANYOUGUAN。YANJIUJISHIYANBIAOMING,ZHIYAOZUKANGBIANHUACHUDESHIYANXIAOYUXINHAOSHANGSHENGSHIJIANDE20%,FANSHEXINHAOJIUBUHUIZAOCHENGWENTI。RUGUOXINHAOSHANGSHENGSHIJIANWEI1ns,NEIMEZUKANGBIANHUACHUDESHIYANXIAOYU0.2nsDUIYING1.2YINGCUN,FANSHEJIUBUHUICHANSHENGWENTI。YEJIUSHISHUO,DUIYUBENLIQINGKUANG,6milKUANZOUXIANDEZHANGDUZHIYAOXIAOYU3cmJIUBUHUIYOUWENTI。

        PCB走线线宽发生变化时,要根据实际情况仔细分析,是否造成影响。需要关注的参数由三个:阻抗变化有多大、信号上升时间是多少、线宽变化的颈状部分有多长。根据上面的方法大致估算一下,适当留出一定的余量。如果可能的话,尽量让减小颈状部分长度。

        XUYAOZHICHUDESHI,SHIJIDEPCBJIAGONGZHONG,CANSHUBUKENENGXIANGLILUNZHONGNEIYANGJINGQUE,LILUNNENGDUIWOMENDESHEJITIGONGZHIDAO,DANBUNENGZHAOBANZHAOCHAO,BUNENGJIAOTIAO,BIJINGZHEISHIYIMENSHIJIANDEKEXUE。GUSUANCHUDEZHIYAOGENJUSHIJIQINGKUANGZUOSHIDANGDEXIUDING,ZAIYINGYONGDAOSHEJIZHONG。RUGUOGANJUEJINGYANBUZU,NEIJIUXIANBAOSHOUDIAN,RANHOUZAIGENJUZHIZAOCHENGBENSHIDANGDIAOZHENG.

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