[SI-LIST] Re: 4 Layer Stackups

Dear Torchia

What means "a design under 15MHz"? Have you measured the spectrum? If the 
spectrum is below 15MHz, the plane capacitance is not important.

Best Regards

Zhangkun
2004.6.25
----- Original Message ----- 
From: "Nic Torchia" <domenic.torchia@xxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Friday, June 25, 2004 4:46 AM
Subject: [SI-LIST] 4 Layer Stackups


> Greetings All,
>  
> 
> Can anyone shed some light on what would be considered a "good" 4 layer
> stackup?  Does anyone have suggestions for reference material I could
> read?
> 
>  
> 
> These are the 2 versions we are currently considering.  Does anyone know
> of any pros/cons for these stackups?
> 
>  
> 
> Sig1/PWR
> 
> GND
> 
> PWR
> 
> Sig2/GND
> 
>  
> 
> or
> 
>  
> 
> GND
> 
> Sig1/PWR
> 
> Sig2/PWR
> 
> GND
> 
>  
> 
>  
> 
>  
> 
> Finally, for a design under 15MHz what is more important: inter-plane
> capacitance (pwr/gnd distance minimized) or signal/plane distance to be
> minimized?
> 
>  
> 
>  
> 
> Thanks,
> 
> Nic Torchia
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Domenic (Nic) Torchia
> 
> Product Engineering Manager
> 
> NORSCAN
> 
> Phone (204) 233-9138 ext.40
> 
> Fax     (204) 233-9188 
> 
> www.norscan.com
> 
>  
> 
> Our Mission:
> 
> "To develop and provide open interface solutions that manage
> 
> and secure the physical layer of communication networks"
> 
>  
> 
>  
> 
> 
> 
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