FEDEVEL
Platform forum

, 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 you
Regards, 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)