[SI-LIST] Re: Diff line
- From: "Zhou, Xingling (Mick)" <xlzhou@xxxxxxxxx>
- To: "'Ben Rothchild'" <benrothchild@xxxxxxxxx>,"Zhou, Xingling (Mick)" <xlzhou@xxxxxxxxx>
- Date: Tue, 19 Feb 2002 09:01:12 -0500
Hi, Ben
Sorry for my late response. I was busy.
Simply speaking, when we say "differential signal", we are talking about
specific (fixed) magnitude and phase relations between signals. At the
output, they may not maintain the same relations because the electrical
effects of the interconnects. We say the modes are converted. We can explain
this phenomena in terms of EM fields or circuits. Since in digital design,
we are so used to circuit concepts, it is described in terms of voltage
waves very well.
Regarding diff. pairs, I would like to introduce you to the following
literature except the books mentioned by some folks.
David E. Bockelman etc. " Pure-mode network analyzer for on-wafer
measurements of mixed-mode S-parameters of differential circuits", IEEE
vol-MTT.45, no.7, July, 1997, pp.1071-1077.
In the past few years, those authours have published several papers dealing
with the theory and measurements.
Hope they may help.
Best regards,
Mick
-----Original Message-----
From: Ben Rothchild [mailto:benrothchild@xxxxxxxxx]
Sent: Friday, February 15, 2002 7:06 AM
To: xlzhou@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: Diff line
Hi Mick,
Can you explain what you mean by modes and
how they affect. I have also heard about
mode conversion in differential lines.
What is this and when does this occur?
Regards,
Ben
--- "Zhou, Xingling (Mick)" <xlzhou@xxxxxxxxx> wrote:
>
> How about modes ? Not just length (timing).
>
> Regards,
>
> Mick
>
> -----Original Message-----
> From: pravin patel [mailto:fairfax100@xxxxxxxxxxxxx]
> Sent: Thursday, February 14, 2002 9:25 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Diff line
>
>
>
> I am doing layout of 2.5Ghz diff. line and having
> hard time to match length
> of a pair by 300 mil. I was going to make one line
> serpentine to make both
> line matched. By doing serpentine, I am creating
> impedance discontinuty or I
> will create skew.
> Any Ideas. Thanks
>
> --
>
>
>
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