Hello:

I was hoping that someone could point me to a reference document that
would explain controlled impedance practices and how the PCB houses
implement this. I am looking for a good place to start to understand how
to control the impedance of boards used for memory cards.

In my particular case, the application environment is 100MHz, and I am
told by the designer that the PCB needs to be 72 ohm +/- 10%.

How do I work with the PCB facility to gaurantee that this is met and
what are some good guidlines to measure the final product to see if it
is meeting spec?

Anyone's help on these questions would be greatly appreciated since I
have a meeting with the PCB vendor next week to discuss this topic.

Thanks in advance,

George Ioakimedes
NEC Electronics, Inc.
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