[SI-LIST] Re: Differential Impedance calculation
- From: "ZHENGGANG CHENG" <zhenggang.cheng@xxxxxxxxx>
- To: Alexandre.AMEDEO@xxxxxxxxxxxxxxxxxx
- Date: Wed, 7 Nov 2007 11:25:59 -0800
Zdiff=Zpp+Znn-2*Zpn
Zdiff---differential impedance;
Zpp---single-ended impedance of positive lane;
Znn---single-ended impedance of negative lane;
Zpn---mutual impedance between P and N.
You can't get the Zdiff by measuring the single-ended impedance of each
lanes, since you can't get the mutual coupling impedance. You need to
measure them at the same time using differential probe.
Zhenggang
2007/11/7, Alexandre.AMEDEO@xxxxxxxxxxxxxxxxxx <
Alexandre.AMEDEO@xxxxxxxxxxxxxxxxxx>:
>
> Hello,=20
>
> Did someone knows how to calculate differential impedance with two =
> different single ended Impedances?
> I measure impedance of differential line with TDR (single ended probe) =
> and the two impedances are different.
>
> Thank you for your help
>
> Alexandre AMEDEO
>
> -----Message d'origine-----
> De : si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]De la part de Jack Mosley
> Envoy=E9 : mercredi 7 novembre 2007 04:07
> =C0 : si-list@xxxxxxxxxxxxx
> Objet : [SI-LIST] Capacitors
>
>
> Hello,
> To evaluate capacitor reliability in THB condition, a circuit using =
> power supply and limiting current resistor connected to the capacitor =
> is used. If a short occurs between the capacitor pin, is the current =
> will exceed the resistor limited current for a short period of time ?
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around=20
> http://mail.yahoo.com=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:
> //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
> //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:
> //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:
> //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:
//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:
//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
Other related posts:
