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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。

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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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