Hi @Marce,
Thank you for those links, i just have some queries w.r.t those links, please try to answer them.
In the first pdf page - 2; explanation about split plane is given, Split Plane has to be avoided and if it is done then the ways suggested to do so are:
1 - Bridge Technique, where both planes are connected and traces are routed over that bridge.
2 - Using optoisolators.
3 - Using Transformers.
4 - Using Differential Traces.
My queries are:
1 - How do we implement Bridge technique physically on board, one thing that i'm doing is connecting those grounds using a 0ohm resistor, what are the other different ways?
2 - I never knew that an optoisolator/transformer can be used in such a way, in fact i have by far not seen any design inculcating such a technique, if these techniques are used then how are they implemented practically on a PCB(since they seem promising theoretically)?
The signal that i'm going to cross over the planes are differential and so i don't have to bother i guess.
The IC itself requires 3 grounds as suggested for it by the manufacturer, and i am isolating the rest of the circuitry with the 4th ground.
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One more query in the 3rd page(first Link/pdf):
3 - In the middle paragraph there is bridge technique suggested for split plane, stating
"If you use this approach, you should make the bridge between the two ground planes as wide as the IC"
Now the way i'm doing it in my board is similar to what is suggested for split planes with bridge technique but i'm not connecting the bridge below the ic, precisely speaking, there is a gap right below the IC between the analog and the digital planes which is the split clearance, now what problems might arise due to this?
Image Here: http://obrazki.elektroda.pl/2884543900_1350973575.jpg
One query on page 4:
The mid Paragraph talks and asserts clearly about the usage of Power plane splitting, and the last but one sentence of the middle paragraph states this:
All traces crossing over the power plane split must be on a layer adjacent to the solid ground plane
what does this mean?
Please let me know if my questions are unclear.
Thank You