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Questions relating to designing PCBs
By kevinlexus
#181648
Hello all! First of all sorry for my english.

I am creating pcb with RJ45 modules like this
Image

There are 2 modules, each contain 8 RJ45 connectors, every of them need to be connected by parallel by bus, like in this schema:

Image

Eagle generated next tracing:
Image

I think this is so complex design. If it possible and will be wonderfull to make it more simple.

Thank you a Lot!

Leo. :)
User avatar
By Ross Robotics
#181662
What is so complex about it? Are you talking about the board? First hint, don't use the auto-router. Manually route the board yourself.
By uChip
#181672
Also, check your fab house design rules. If you can get a trace between pads it will simplify the routing enormously.
By kevinlexus
#181682
uChip wrote:Also, check your fab house design rules. If you can get a trace between pads it will simplify the routing enormously.
Thank u very much for your reply.
I've set more narrow trace, and have reduced clearance in the design rule settings of Eagle. And now i get this
result, but i afraid of troubles in making this pcb with such narrow traces..

Image
By Valen
#181683
That is why uChip said to ask your PCB manufacterer service which trace dimensions are allowed or recommended.

What are those traces going to conduct any way? Signal level currents or power currents? That might be another limiting factor on the minimum width.
By kevinlexus
#181685
Valen wrote:That is why uChip said to ask your PCB manufacterer service which trace dimensions are allowed or recommended.

What are those traces going to conduct any way? Signal level currents or power currents? That might be another limiting factor on the minimum width.
Thank you. This will be traces for signals and for low power current. I will think about limitations, which may arise during the development process.
User avatar
By Ross Robotics
#181687
What fab house are you using? Do you really have 3 separate boards with traces connecting them? Get rid of the right angles..
By davep238
#181720
kevinlexus wrote:
uChip wrote:Also, check your fab house design rules. If you can get a trace between pads it will simplify the routing enormously.
Thank u very much for your reply.
I've set more narrow trace, and have reduced clearance in the design rule settings of Eagle. And now i get this
result, but i afraid of troubles in making this pcb with such narrow traces..

Image
If you are making this at home, you may have to worry about narrow traces. If you are going to use a board house, then check its design rules. Most places can handle traces and spaces down to 8 mil. Some can do 6 mil.
Regarding your board - traces should intersect only at 90 degrees, not something smaller like 45 degrees. BTW, 90 degree corners are OK, though 45 degree corners look better.