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多长的走线才是传输线

时间:2016-12-11      浏览次数:

多长的走线才是传输线?

这和信号的传播速度有关,在FR4板材上铜线条中信号速度为6in/ns。简单的说,只要信号在走线上的往返时间大于信号的上升时间,PCB上的走线就应当做传输线来处理。

WOMENKANXINHAOZAIYIDUANZHANGZOUXIANSHANGCHUANBOSHIHUIFASHENGSHENMEQINGKUANG。JIASHEYOUYIDUAN60YINGCUNZHANGDEPCBZOUXIAN,RUTU1SUOSHI,FANHUILUJINGSHIPCBBANNEICENGKAOJINXINHAOXIANDEDIPINGMIAN,XINHAOXIANHEDIPINGMIANJIANZAIYUANDUANKAILU。

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XINHAOZAIZHEITIAOZOUXIANSHANGXIANGQIANCHUANBO,CHUANSHUDAOZOUXIANJINTOUXUYAO10ns,FANHUIDAOYUANDUANYOUXUYAO10ns,ZEZONGDEWANGFANSHIJIANSHI20ns。RUGUOBASHANGMIANDEXINHAOWANGFANLUJINGKANCHENGPUTONGDEDIANLIUHUILUDEHUA,FANHUILUJINGSHANGYINGGAIMEIYOUDIANLIU,YINWEIZAIYUANDUANSHIKAILUDE。DANSHIJIQINGKUANGQUEBUSHIZHEIYANG,FANHUILUJINGZAIXINHAOSHANGHOUZUICHUDEYIDUANSHIJIANYOUDIANLIU。

778专业棋牌测评网ZAIZHEIDUANZOUXIANSHANGJIAYIGESHANGSHENGSHIJIANWEI1nsDEXINHAO,ZAIZUICHUDE1nsSHIJIAN,XINHAOHAIXIANTIAOSHANGZHIZOULE6YINGCUN,BUZHIDAOYUANDUANSHIKAILUHAISHIDUANLU,NEIMEXINHAOGANJUEDAODEZUKANGYOUDUODA,ZENMEQUEDING?RUGUOBAXINHAOWANGFANLUJINGKANCHENGPUTONGDEDIANLIUHUILUDEHUAJIUHUICHANSHENGMAODUN,SUOYI,BIXUANCHUANSHUXIANCHULI。

SHIJISHANG,ZAIXINHAOXIANTIAOHEFANHUIDIPINGMIANJIANCUNZAIJISHENGDIANRONG,RUTU2SUOSHI。DANGXINHAOXIANGQIANCHUANBOGUOCHENGZHONG,ADIANCHUDIANYABUDUANBUBIANHUA,DUIYUJISHENGDIANRONGLAISHUO,BIANHUADEDIANYAYIWEIZHECHANSHENGDIANLIU,FANGXIANGRUTUZHONGXUXIANSUOSHI。YINCIXINHAOGANSHOUDAODEZUKANGJIUSHIDIANRONGCHENGXIANCHULAIDEZUKANG,JISHENGDIANRONGGOUCHENGLEDIANLIUHUILIUDELUJING。XINHAOZAIXIANGQIANCHUANBOSUOJINGGUODEMEIYIDIANDOUHUIGANSHOUDAOYIGEZUKANG,ZHEIGEZUKANGSHIBIANHUADEDIANYASHIJIADAOJISHENGDIANRONGSHANGCHANSHENGDE,TONGCHANGJIAOZUOCHUANSHUXIANDESHUNTAIZUKANG。

6.2.jpg

778专业棋牌测评网DANGXINHAODAODAYUANDUAN,YUANDUANDEDIANYASHENGZHIXINHAODEZUIZHONGDIANYAHOU,DIANYABUZAIBIANHUA。SUIRANJISHENGDIANRONGHAISHICUNZAI,DANSHIMEIYOUDIANYADEBIANHUA,DIANRONGXIANGDANGYUKAILU,ZHEIDUIYINGDEJIUSHIZHILIUQINGKUANG。

因此,这个信号路径短期的表现和长期的表现不一样,在起始一小段时间内,表现就是传输线。即使传输线远端开路,在信号跳变期间,传输线前段的性能也会像一个阻值有限的电阻。

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