FreeLists / si-list / [SI-LIST] Re: Propagation delay difference

["Kihong Kim" <joshuakh@xxxxxxxxx>]

Hi JongBae,
Regarding the Question on :

"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?"

Based on the assumption "homogeneous -> strip" and "inhomogeneous ->
microstrip",

I think that
Inhomogeneous dielectric medium makes the electric field asymmetric toward
more for higher dielectric material whereas magnetic filed remains same
symmetric distribution in most application of electronic design environment
(PCB, Silicon,...However, perhaps it might not be a good assumption for
compound semiconductor)

Hope this is helpful.

Kihong Joshua Kim
SI Engineer, Photonics and Electronics


On 3/9/07, William Kitchen <WKitchen@xxxxxxx> wrote:
>
> Since both modes play a role in the propagation of a signal in a tightly =
> coupled diff pair, does this difference in prapagation time cause a =
> distortion in the shape of the signal, part of it arriving a little =
> ahead of the rest? Would this be a reason to favor looser coupling?
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ihsan Erdin
> Sent: Friday, March 09, 2007 5:50 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/-------------------------------------------------=
> -------
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > http://www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> >                 http://www.si-list.net
> >
> > List archives are viewable at:
> >                 http://www.freelists.org/archives/si-list
> > or at our remote archives:
> >                 http://groups.yahoo.com/group/si-list/messages
> > Old (prior to June 6, 2001) list archives are viewable at:
> >                 http://www.qsl.net/wb6tpu
> >
> >
> >
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
>                http://www.si-list.net
>
> List archives are viewable at:    =20
>                http://www.freelists.org/archives/si-list
> or at our remote archives:
>                http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>                http://www.qsl.net/wb6tpu
> =20
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
>                http://www.si-list.net
>
> List archives are viewable at:
>                http://www.freelists.org/archives/si-list
> or at our remote archives:
>                http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>                http://www.qsl.net/wb6tpu
>
>
>


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu