Dear all, I have a question which was confused me for a long time, that is which one is important between Diff. Impedance and its trace length matched/spacing(Noise immunity)? As my viewpoint I supposed that trace length matched and spacing is more important compared to Diff. Impedance. Because sometimes we focus on impedance for its signal quality as well as EMC concern. But in Diff signal I am not so sure that whether the Impedance is so important as Single-Ended signal, because if the impedance doesn't mismatch so seriously then I prefer to focus on trace match and Spacing for my direct intuition. And I also confuse that sometimes we want to match its Impedance then sacrifice its Spacing, in this way maybe D+ and D- can't reference to each other and lose its noise immunity. Does it correct or not? I'll appreciate if you give me a correct conception, thanks. Regards, Binchuan.Wang HW EE ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu