pcb廠家淺談為何在PCB設計里不(bu)能(neng)有直角走線(xian)?

　　在PCB設計(ji)布(bu)線中都是要求盡(jin)量(liang)避(bi)免出現(xian)直角(jiao)走線的現(xian)象，同時這(zhe)也是衡量(liang)布(bu)線的好壞的標準(zhun)之一，這(zhe)個究(jiu)竟(jing)是為何(he)要這(zhe)樣(yang)制約呢?直角(jiao)走線究(jiu)竟(jing)會對信號傳輸產生(sheng)多(duo)大(da)的影響呢?

　　從原理上說(shuo)，直角(jiao)走線(xian)會(hui)使傳輸線(xian)的(de)線(xian)寬發生(sheng)變(bian)(bian)化，造成阻抗(kang)的(de)不連續。其實(shi)不光是直角(jiao)走線(xian)，頓角(jiao)，銳角(jiao)走線(xian)都可能會(hui)造成阻抗(kang)變(bian)(bian)化的(de)情況。

　　直(zhi)角走(zou)線(xian)的對信號的影響就是主要體現在三個方面：

　　一是(shi)拐角可以等效為(wei)傳輸線(xian)上的容性(xing)負載，減緩上升時(shi)間(jian);

　　二是(shi)阻(zu)抗不連續會(hui)造成信號的反射;

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