[SI-LIST] Re: Propagation delay difference
- From: "Peterson, James F \(EHCOE\)" <james.f.peterson@xxxxxxxxxxxxx>
- To: <erdinih@xxxxxxxxx>, <jbtera77@xxxxxxxxx>
- Date: Fri, 9 Mar 2007 06:39:24 -0600
I must be missing something, if the dielectric constant doesn't change
in the medium, how can a differential signal travel faster than a single
ended signal?
Jim Peterson
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ihsan Erdin
Sent: Friday, March 09, 2007 6:50 AM
To: jbtera77@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Propagation delay difference
Jongbae,
Even in an homogeneous coupled stripline structure, the wave speed is
not the same for even and odd propagation modes, hence the difference
between common and diff. mode prop. delays. For cases where mutual
coupling is very small they get close but theoretically there'll be a
difference. The same reasoning applies to the coupled microstrip
lines.
Regards
Ihsan
On 3/9/07, jbtera77@xxxxxxxxx <jbtera77@xxxxxxxxx> wrote:
> Hi, all
> As all know, in homogeneous strip line, the propagation speed is the
same
> for both differential and common mode.
>
> However, in inhomogeneous microstrip line, the propagation speed of
> differential mode is faster than that of common mode.
> In specific, the value of Cm/C is higher than Lm/L in inhomogeneous
> microstrip line while the values are same in homogeneous strip line?
>
> Could somebody let me know why it physically is?
>
>
> Thanks in advance,
> Jongbae Park.
>
>
>
> --
> --------------------------------------------------------Ph.D Candidate
> StudentTerahertz Interconnection & Package Laboratory,Department of
> Electrical Engineering, Korea Advanced Institute of Science and
Technology
> (KAIST),373-1, Kusong-dong, Yusong-ku, Taejon 305-701,
>
KoreaFax)+82-42-869-8058Tel)+82-42-869-5458Mobile)+82-11-9787-7966E-mail
)
> pjb77@xxxxxxxxxxxxxxxxxxxxxx URL)
>
http://tera.kaist.ac.kr/------------------------------------------------
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