FreeLists / si-list / [SI-LIST] Re: LVDS Routing

["Gupta, Deepali" <Deepali.Gupta@xxxxxxxxx>]

I really don't understand the problem you are having but just to give my two
cents is that you would rather have a via on your LVDS trace than have them
mismatched in length. A number of times having vias are unavoidable anyway
especially if you are routing using stripline. 
I have used vias on LVDS traces running upto 480Mbs without any problems.
Mismatch usually results in skew and 3-4 mm ( 150 mils)is a fairly big
difference for LVDS.    


Regards,
Deepali Gupta
Product Engineer
Actel Corporations



-----Original Message-----
From: Mehrdad Salami [mailto:msalami@xxxxxxxxxx]
Sent: Thursday, July 10, 2003 1:36 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] LVDS Routing


Hi,

I hope someone can help me here.
I am using RJ45 connector for sending and receiving LVDS signals. The
standard pins for the RJ45 is not straightforward and I have two options
of 1 - using via for the LVDS signals 
2 - having different track length for LVDS signals
I am not sure which one is better. The frequency for LVDS signals are
230 MHz. The different length in option 2 would be 3-4 mm.

 

Regards,

Mehrdad Salami
Hardware Design Engineer
Colour Vision Systems
 

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