[SI-LIST] Re: Heatsink acting as EMI shield.
- From: steve weir <weirsp@xxxxxxxxxx>
- To: gguida@xxxxxxxxxx, <trilok.budathoki@xxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 15 Jul 2004 01:18:51 -0700
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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