I have several very long traces > 18 inches that are approximately parallel and divide up the pcb into sections(this is due to routing between distant components such as proving a clock). Because I'm doing this on a 2-layer board and it has potential for relatively large currents and changes I want to distribute the ground and vcc better across the board.
So think of a board of, say, 19x6 with 3 long traces parallel to the long edge of the pcb separated by about 1.5 inches.
Now what I'm doing is sorta "stitching" across the traces somewhat uniformly long the 3 traces so that the ground currents do not have to flow inward from the sides of the board.
-----++++-----++++----- C
-----++++-----++++----- C
-----++++-----++++-----
Where the +'s are jumpers(through vias on the other layer) to connect the two "sides". The idea is to reduce the impedence of the ground as seen by some components designated by C.
Any problems doing it this way? Please don't bitch/preach to me about using
2 layers or having long parallel traces or whatever... I have reasons for using 2 layers... the most important one being cost and that the circuit is relatively simple enough that it should work fine with 2 layers. I simply want to optimize it before I send it off for fab.I really doubt I probably even need to do that but, again, it's just an "optimization" that doesn't seem to hurt? May not help much but thats besides the point.
Alternatively I could alternate the long traces to change layers regularly:
-----++++-----++++----- C
-----++++-----++++----- C
-----++++-----++++-----
Where + now means on the "other layer".
This is not really an option though because I actually have several other traces, it creates potential transmission issues, and there are some other traces on the other layer that makes it difficult.
In any case, if it's not clear:
A copper pour will eventually be added connecting the two sides to gnd.