传导式 EMI 的测量技术二返回路径返回路径对杂讯电流而言,真正的返回路径(return path)是什么呢?实体的电气路径之间的距离,最好是越大越好。
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When calculate the inductance of the interconnection, it should refer to the return path. In order to reduce the inductance, we need to put the signal path close to the return path, and reduce the trace or wire length.
要减小电感,就是使得信号路径要尽量靠近返回路径,和尽量减小线长。
参考来源 - IC封装中的寄生参数的研究·2,447,543篇论文数据,部分数据来源于NoteExpress
我的问题是:知道为什么会返回路径?
函数的作用是:返回路径中的目录名称。
The dirname function returns the directory name from a path.
返回路径中包括了可选的主机和发送者邮箱列表。
Return to the path including the optional mainframe and mail senders list.
So there's a return branch on every possible path through the code. And that's valuable, it's something you want to think about as your right your own.
所以代码中每条可能的路径,都会有一个返回值分支,这是非常有价值的,当你自己写程序的时候也应该考虑这件事。
OK. Note, by the way, if I chase through each possible path, like there's some IFs in here, if there's some places to go, at least in this piece of code, every possible path through this code ends in a return. And that's a good programming discipline, to make sure that happens.
注意一下,如果我跟进每一条可能的路径,像是这里的,起码在这段代码中就有很多走向,这段代码中的每一条可能路径,在结尾都会返回一个值,这就是一条很好的编程定律,请确保这样做。
If it isn't, then I'm going to go back around the loop, and notice what happens. If I get all the way around the loop, that is, all the way through that FOR loop and I never find a path that takes me through here, then the last thing I'm going to do is return a pair or a tuple with a special simple number none twice.
如果没有,我会回到循环看看发生了什么,如果我运行了整个循环,也就是整个for循环,我仍没有找到符合条件的路径,那么我最后做的事情就是返回一对,或者一个数组的两次none值。
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