[SI-LIST] Re: Heatsink acting as EMI shield.
- From: "giancarlo guida" <gguida@xxxxxxxxxx>
- To: "steve weir" <weirsp@xxxxxxxxxx>, <trilok.budathoki@xxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 15 Jul 2004 10:29:37 +0200
Hi Steve,
time ago I worked for Incases GmbH, now part of Zuken,
we had a tool: EMC Engineer where some opf this research for
radiation from heatsink were implemented in a quite nice user interface
Giancarlo
----- Original Message -----
From: "steve weir" <weirsp@xxxxxxxxxx>
To: <gguida@xxxxxxxxxx>; <trilok.budathoki@xxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Thursday, July 15, 2004 10:18 AM
Subject: Re: [SI-LIST] Re: Heatsink acting as EMI shield.
> Giancarlo, there is lots of data theoretical and empirical that
establishes
> floating metal as a very bad idea for EMC.
>
> Steve
> At 09:15 AM 7/15/2004 +0200, giancarlo guida wrote:
> >it looks strange that the heatsink left floating
> >will efficiently shield the radiated field.
> >
> >I knew a study performed at University of Missouri
> >and implementend in some EMC simulators
> >( hope to remember correctly) where heatsink-groundplane
> >act as an efficient antenna if there is a difference of voltage
distibution
> >between them.
> >
> >Hope this help
> >Giancarlo
> >
> >
> >----- Original Message -----
> >From: "Budathoki, Trilok (GE Consumer & Industrial)"
> ><trilok.budathoki@xxxxxx>
> >To: <si-list@xxxxxxxxxxxxx>
> >Sent: Thursday, July 15, 2004 9:13 AM
> >Subject: [SI-LIST] Heatsink acting as EMI shield.
> >
> >
> >Hello Everyone
> >
> >I was read an articles that mentions the PGA & BGA packages have an
> >efficient heatsink on the top of the package, which not only serves to
> >dissipate the heat, but also acts as an EMI shield.
> >Does it mean EMI is achieved as one end of heatsink is connected to Gnd.
> >If the Heatsink is left floating. How can it act as EMI shield. Can
anyone
> >explain.
> >Thanks
> >Trilok Budathoki
> >GE - India Business Center
> >*: 91-40-27881731
> >* : trilok.budathoki@xxxxxx
> >
> >
> >
> >
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