Hi there,
Is there any kind of book, website, magazine or anything related to PCB board layout design which contains tips and tricks? For example in low speed circuits your trances can have abrupt 90 degree change of direction. But in high frequency circuits, your traces needs to change at a lower angle say 45. I need this kind of tips. Is there any source?
Thanks
90 degree tracks shouldn’t really be used at any frequency, they look unprofessional and can cause etching problems.
Leon
There aren’t any books that I know of that are aimed at such a basic level (and I honestly don’t mean that in an insulting way). There are however, a bunch that start there and quickly move up to some pretty hardcore stuff, like the series inductance of vias and so forth. They tend to be pretty expensive though, as it’s rather specialist stuff, and most of it is probably not the kind of stuff you’re interested in. Any book for “high speed” electronics will have PCB design guidelines.
Electromagnetics Explained is pretty good, and covers a lot of ground without being too expensive.
http://www.amazon.com/Electromagnetics- … 392&sr=8-1
The best ways to learn are to ask people who know, and to just try it and not be afraid of making mistakes.
Etching problems and cosmetics are really the only reasons to worry about corner angles. Here’s a study showing that corner configuration has no measurable effect on signal reflection or radiated energy: http://www.montrosecompliance.com/Techn … -Japan.pdf (up to 3GHz).
Stick to 45 degree angles only. Some people use weird angles and it ends up looking very messy.
Yes, you're reading a good PCB related forum right now...smdFan:
Hi there,Is there any kind of book, website, magazine or anything related to PCB board layout design which contains tips and tricks?
That’s an interesting paper, macegr. Thanks.
The book I posted a link to also backs the conclusions, saying that until you reach 10GHz, 90 degree corners have essentially negligible effect on the signal transmission qualities of the transmission line. Above 1GHz, a 90 degree corner will add a parasitic capacitance of 1 to 200 femtofarads (yes, that’s 10^-15!). The rest of my reference books are unfortunately at work.
It just goes to show, there’s a lot of misinformation out there regarding signal integrity, and you should take everything with a grain of salt unless you can confirm it by measurement.
Yeah…I always radius all my corners anyway, because it makes me feel better. 
Have you seen [http://en.wikibooks.org/wiki/Practical_ ... PCB_Layout](http://en.wikibooks.org/wiki/Practical_Electronics/PCB_Layout) ?smdFan:
… any kind of book, website, … related to PCB board layout design