[SI-LIST] Re: What will happen if differential channel is not symmetric?
- From: Javid Mohamed <mailjavid@xxxxxxxxx>
- To: Chen Jikai <yfgchen@xxxxxxxxxxxx>, Istvan Novak <istvan.novak@xxxxxxx>
- Date: Fri, 24 Jul 2009 09:30:16 +0530 (IST)
Asymmetires would also cause some of the differential signal component into
your common signal and therefore increasse EMI.
Javid
--- On Thu, 23/7/09, Istvan Novak <istvan.novak@xxxxxxx> wrote:
From: Istvan Novak <istvan.novak@xxxxxxx>
Subject: [SI-LIST] Re: What will happen if differential channel is not
symmetric?
To: "Chen Jikai" <yfgchen@xxxxxxxxxxxx>
Cc: si-list@xxxxxxxxxxxxx
Date: Thursday, 23 July, 2009, 1:07 PM
The short answer is YES for both in your case. Skew is primarily
dependent on the effective permittivity: in microstrip the effective
permittivity is also geometry dependent, so skew (though small) will
also occur.
This kind of asymmetry shows up also in glass-reinforced laminates due
to glass-weave effects even if the two traces are identical in cross
section. There have been many publications recently on this subject:
one from the SUN team is: DesignCon2007, Santa Clara, CA, January 29-31,
2007, Losses Induced by Asymmetry in Differential Transmission Lines,
posted at http://www.electrical-integrity.com/ >> Paper download.
Regards,
Istvan Novak
SUN Microsystems
Chen Jikai wrote:
> Hi,
> I have been simulating some transmission line structures and one thing popped
> up. What will happen if differential channel is not symmetric? For example,
> suppose I have two coupled microstrips and one's width is bigger than the
> other. Does this mean the channel will suffer from skew and will convert some
> odd mode stimulus to even mode?
>
> Thanks a lot in advance!
>
>
>
>
>
>
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