[SI-LIST] Re: Why is capacitor with high ESR
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: cgrassosprint1@xxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 08 Dec 2004 13:47:34 +0800
Dear Charles
I have studied G-P-G case. What kind of situation are you interesting of?
Best Regards
Zhangkun
2004.12.8
----- Original Message -----
From: "Charles Grasso" <cgrassosprint1@xxxxxxxxxxxxx>
To: <zhang_kun@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Cc: <istvan.novak@xxxxxxxxxxxxxxxx>; <weirsp@xxxxxxxxxx>;
<Chris.Cheng@xxxxxxxxxxxx>
Sent: Wednesday, December 08, 2004 11:31 AM
Subject: [SI-LIST] Re: Why is capacitor with high ESR
> Dear Zhangkun,
>
> First - Thanks for your observations.
>
> I have a question for you. If the pwb stack up had *multiple" ground planes
> would you think all your observations would still be valid?
>
> Charles Grasso
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of zhangkun 29902
> Sent: Tuesday, December 07, 2004 3:47 PM
> To: si-list@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Cc: istvan.novak@xxxxxxxxxxxxxxxx; weirsp@xxxxxxxxxx;
> Chris.Cheng@xxxxxxxxxxxx
> Subject: [SI-LIST] Re: Why is capacitor with high ESR
>
>
> Dear all
>
> This morning, I spend half one hour to review all the mail about this topic.
> According to my experience, there is the following views:
> 1.Dency via will not absorb or scatter the EM energy. We have made
> testing PCB to study this problem. When there is no decoupling caps, the
> dency via will affect the resonance. While there is decoupling caps on the
> PCB, the effect of dency via could be ignored. In DesignCon 2004, we have
> proposed one paper.
> 2.Via along the edge of PCB will not help to eliminate the far field EMI.
> The via has no effect on reflecting EM energy unless the power and ground
> plane is connected by via. The voltage source will be shorted. We have made
> testing PCB to study this problem.
> 3.Steve and Chris have proposed seven cases about the PCB decoupling. We
> have measured almost the seven cases. The result is that the caps with high
> ESR help on eliminate power ground noise.
> 4.I have done some simulation about SI+PI. I do not see any great
> difference when the signal referenced to power or ground. There is a little
> difference because of the displacement current. I think power and ground are
> same but the voltage potential.
>
> Best Regards
>
> Zhangkun
> 2004.12.8
>
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