[SI-LIST] Re: Power integrity / Transient current in Target impedance
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: saeedbakhshi@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 11 Dec 2003 18:52:41 +0800
Dear Saeed:
In power integrity analysis, the I_noise is the most important and the most
difficult element. There is one method to calculate the I_noise proposed by
Larry Smith.
I_noise=P_max/2/V
I hope this will help.
Best Regards
Zhangkun
2003.12.11
----- Original Message -----
From: "Saeed Bakhshi" <saeedbakhshi@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Thursday, December 11, 2003 5:13 PM
Subject: [SI-LIST] Power integrity / Transient current in Target impedance
> Hi
>
> I have reviewed all si-list threads regarding to power integrity and
> decoupling cap selection. all have said that there must be a target impedance
> and this target impedance should be met up to several harmonics of existing
> clocks frequencies ; and the target impedance is calculated using the below
> equation:
> Target impedance= VDD x (Voltage tolerance) / "I_transient"
>
> OK, But nobody explain how "I_transient" value could be calculated.
>
> In all datasheets there is a ICC(current drawn from power supply) in
> absolute maximum rating table. Is this ICC the same "I_transient"? or a
> fraction of ICC should be used as "I_transient"?
>
> What is the relationship between ICC mentioned in the "Absolute maximum
> rating table of Chip datasheets" and the "I_transient" in target impedance
> formula?
> any comment is appreciated.
>
>
> Regards,
> Saeed Bakhshi
>
>
>
>
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