USB data lines routing
, 07-19-2024, 09:09 AM
Hello,I would like to ask what is better? One higher arc or two smaller for length matching? I use mitered arc with 30% miter. Spacing is set according to spacing in my diff pair setting.Thank youRegards, Martin
, 07-21-2024, 01:52 PM
please, don't forget on my post. Thx
QDrives , 07-21-2024, 07:43 PM
Both have their possible advantages.The smaller arcs keep the signals closer together.However, a single bigger one can correct the mismatch faster.Do note that the best place to place them is near the corner that cause the length mismatch.
, 07-21-2024, 08:24 PM
Thank you qdrives. What about arc traces, not 45 degrees. Where to place length matching when using arcs?In my opinion.. Near to arcs where the biggest difference arose?
QDrives , 07-21-2024, 09:03 PM
Regardless of arcs or 45 degrees, you want to compensate a close as possible to the length mismatch.But that is mainly for the high high speed signal.I do not know if this is USB 2, 3, or 4, but for USB 2 you do not need to put that much effort in it.
, 07-22-2024, 04:45 AM
Usb2 and 3 - D+- and tx/ rx
User , 07-24-2024, 06:51 AM
Smaller arcs are better to reduce self xtalk
QDrives , 07-24-2024, 07:29 PM
It is the spacing between the traces. A minimum of 3x the line width or 3x H(eigt above return plane)
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