Re: [SI-LIST] : Differential pair - How to compensate for different length?

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From: Vinu Arumugham ([email protected])
Date: Mon Jan 29 2001 - 09:39:08 PST

You may not need any compensation. The trace that is shorter on the PCB is
connected to a longer trace on the BGA.

Thanks,
Vinu

Shahar Eytan wrote:

> Hi All,
>
> I need to connect high speed lines from a Fine BGA to a connector
> using differential lines. The positive and negative outputs from the FBGA
> resides in row 1 and 2 of the FBGA, that means ~35 mils of difference
> between the lines.
> What is the right way to compensate for this difference?
> I was thinking that the best way is to go strait out with from the
> internal ball, while the second one (from the external row) will "pay" for
> his shorter way by few turns as close as possible to the source. This way
> the differential pair will be coupled together all the way to the connector.
> Same for the receiver.
> What do you think?
>
> Shahar Eytan
> Mellanox Technologies Ltd.
> <mailto:[email protected]>
> Tel: 972-4-9593244 ext 264
> Fax: 972-4-9593245
>
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