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And thanks in advance for any responses on this one as this
is yet another strange emerging requirement in the high speed design
world. We have seen discontinuities on 100OHM diff pairs that has
been root caused to the weave of the dielectric material. The weave
material has a different Dk than the epoxy, and one side of the pair may
parallel the weave wile the other parallels the epoxy. We have seen Intel
information that talks about this effect and both the Intel data sheet and the manufacturing vendor recommend
that the design be rotated 10-15 degrees as the solution. I believe it is
impractical to lay out the design like this so I decided to apply the rotation
factor at manufacturing output time. This causes me 2 problems one I
don't like but can deal with is I have to maintain 2 databases at output
for 2 reasons the assembler can't deal with the rotation on the data
coming in i.e. pick and place fabmaster and ICT. The 2nd is ECO maintenance of
the design going forward would be done on the orthogonal or non rotated
version. The 2nd problem is disturbing to me and have not found a good way
to fix yet. After rotating the design 11.25 degrees I have thousands of
DRC's on a design that had none. Even after turning off same net DRC I
still had thousands. This is unacceptable. Does anyone have any experience with
this? Maybe I need a different approach. Passing it off to the
vendor to do though nullifies the IPC356 netlist test as none of points
match from the CAD netlist to the vendor rotated artwork, so that is out golden
board test does not work for us.
Since this stems at the fab sho,p can the fab shop do something about it ? What prevents them from rotating the dielectric before applying it?-barbara Seeger - Cadence
We had this problem and we found no physical work around. It seems to be due to rounding of the spacings. You also get thousands of uncoupled length issues as well. We have tried a couple of variation since with no real success. If the traces are localised and few, then you can copy the traces and rotate them whilst keeping the rest of the design square. Ideally get the PCB vendor to rotate the design within the cad tool once they have run their checklists. In my experience the front end tools can handle pre-rotated designs but they can take much longer to process.KP
Signifigant change in tooling and process. Tooling is not currently set
up for this but maybe it can in the future, actually the best solotion
would be for the material vendor to produce weave at at 10-15 degrees,
but the same is true for them requires a signifigant change in their
tooling and processing.
Front end can handle most of the roatation, I am told that the text is
not done properly with Valor, I don't have Valor so can't verify this.
Bottom line is if the vendor does they want to send the artwork back to
us and us to approve it and be responsible for it, if this is the case
I might as well do it myself and check myself but very difficullt to
feel confident about the check when allegro's DRC goes wacko. As
far as I see it either the clearances were right orthoganal no matter
what way I rotate it should be the same. I have uncoupled diff
pair that are off by 30 and 40 MILs now when the were exactly on