[SI-LIST] Re: PCB tracks
- From: Doug Brooks <doug@xxxxxxxxxx>
- To: PhilippeR@xxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 08 Aug 2002 18:32:26 -0700
On the Ultracad web site (www.ultracad.com) there is an article entitled
"90 Degree Corners, The Final Turn," reprinted from PC Design Mag. It
reports on a study that confirms that there is no "problem" (impedance or
EMI) with 90 degree corners. We use 45 degree corners in our designs
because we like them better!! But there is no definitive reason to favor
any shape over any other (including diabolical 135 degree sharp corners!).
Doug Brooks
At 10:22 AM 8/7/02 +0100, Philippe Robert wrote:
>Hi there,
>
>I am currently in the process of doing a new PCB, at the routing stage. In
>the router that I am using, there is an option to have 90-degree or
>45-degree angles on the tracks. I know that it is better to have the option
>set to 45 to avoid changing too much the impedance of the tracks. I designed
>few board using that option.
>
>In the router, there is an other option to have curves instead of angles on
>the tracks. Theoretically, it should be better in terms of impedance as the
>width of the track vary even less.
>
>Could someone tell me if curves are better than 45-degree angles and why ?
>
>Best regards.
>Philippe.
>
>
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