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

About this list Date view Thread view Subject view Author view

From: Vinu Arumugham (vinu@cisco.com)
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:shahar@mellanox.co.il>
> Tel: 972-4-9593244 ext 264
> Fax: 972-4-9593245
>
> **** To unsubscribe from si-list or si-list-digest: send e-mail to
> majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
> si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
> si-list archives are accessible at http://www.qsl.net/wb6tpu
> ****

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:30:46 PDT