[SI-LIST] Re: Differential Impedance calculation
- From: <art_porter@xxxxxxxxxxx>
- To: <Alexandre.AMEDEO@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 7 Nov 2007 13:24:38 -0700
Alexander:
You may want to read Eric Bogatin's app note at =
http://cp.literature.agilent.com/litweb/pdf/5988-4796EN.pdf
There is also a recent webcast on this exact topic at =
http://agilent.techonline.com/s/agilent_apr1806
Art Porter
Agilent Technologies
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of ZHENGGANG CHENG
Sent: Wednesday, November 07, 2007 12:26 PM
To: Alexandre.AMEDEO@xxxxxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Differential Impedance calculation
Zdiff=3DZpp+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,=3D20
>
> Did someone knows how to calculate differential impedance with two =3D
> different single ended Impedances?
> I measure impedance of differential line with TDR (single ended probe) =
=3D
> 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=3DE9 : mercredi 7 novembre 2007 04:07
> =3DC0 : si-list@xxxxxxxxxxxxx
> Objet : [SI-LIST] Capacitors
>
>
> Hello,
> To evaluate capacitor reliability in THB condition, a circuit using =
=3D
> power supply and limiting current resistor connected to the capacitor =
=3D
> is used. If a short occurs between the capacitor pin, is the current =
=3D
> will exceed the resistor limited current for a short period of time ?
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