资料下载
×
90度走线(90 Degree Corners)
消耗积分:0 |
格式:rar |
大小:555 |
2009-10-18
JO_lucky
分享资料个
90度走线(90 Degree Corners):Only a few topics generate the kind of enthusiastic
discussion that a right angle corner on a trace does. Just
the mention of 90o corners --- regardless of whether you
say that they shouldn’t be used of if you say that they are
harmless and can be used without concern--- guarantees
a response from people with the opposite view.
Arguments against 90o corners fall into two categories:
Impedance mismatch: A right angle corner is, necessarily,
wider than the rest of the trace. This results in a
decrease in Zo, the intrinsic impedance of the trace, and
therefore causes an impedance mismatch at the corner.
This, in turn, causes reflections, signal distortions, and
noise along the trace.
I’ve even heard one speaker at a conference use the
misguided analogy of electrons being like marbles; they
will (he alleged) reflect back from a sharp 90o corner but
“bounce around” a 45o one! (Honest, electrons don’t act like that.)
discussion that a right angle corner on a trace does. Just
the mention of 90o corners --- regardless of whether you
say that they shouldn’t be used of if you say that they are
harmless and can be used without concern--- guarantees
a response from people with the opposite view.
Arguments against 90o corners fall into two categories:
Impedance mismatch: A right angle corner is, necessarily,
wider than the rest of the trace. This results in a
decrease in Zo, the intrinsic impedance of the trace, and
therefore causes an impedance mismatch at the corner.
This, in turn, causes reflections, signal distortions, and
noise along the trace.
I’ve even heard one speaker at a conference use the
misguided analogy of electrons being like marbles; they
will (he alleged) reflect back from a sharp 90o corner but
“bounce around” a 45o one! (Honest, electrons don’t act like that.)
声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人，不代表电子发烧友网立场。文章及其配图仅供工程师学习之用，如有内容侵权或者其他违规问题，请联系本站处理。 举报投诉
评论(0)
发评论
- 相关下载
- 相关文章
