Hi all
Does anyone know whether the ac coupling caps for PCIExpress should be located at the gold fingers or at the bridge chip. I have a layout in front of me and putting the caps next to the gold fingers would make the discontinuity just a little bit bigger, but putting them next to the bga adds another seperate discontinuity. The only advice that I've found says that they should go at the bridge but doesn't say why.
Any pointers appreciated.
Colin
I don't see why it would matter where the caps go. At the frequencies of the link they look pretty much like wires anyway. This is not the same as a series termination resistor.
The important th> Hi all
Thats what i have found out, as for the caps the spec i have seen says that they should be no bigger than 0603 and between 75nF to 200nF, if that is of any help.
REGARDS IAN.
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