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3W原则[通俗易懂]
2022-07-05 13:55:00 【全栈程序员站长】
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目的:
为了减少走线之间的电磁串扰。
方法:
两个走线中心间距至少得大于3倍的线宽。如果线中心距不少于3倍线宽时,则可保持70%的线间电场不互相干扰,称为3W原则。如要达到98%的电场不互相干扰,可使用10W原则。一般在设计过程中因走线过密无法所有的信号线都满足3W的话,我们可以只将敏感信号采用3W处理,比如时钟走线、差分线、视频、音频,复位线,以及其他系统关键电路等,多个高速信号线长距离走线的时,为了减少线与线之间的串扰,必须强制使用3W原则。
用规则进行约束,但是规则用的两线之间的距离是边缘距离。因此规则设置的值应为10.8 。 (即线宽的两倍10.8=5.4X2)
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