[SI-LIST] Re: [!! SPAM] Re: 6 layers stackup
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Joel Brown <joel@xxxxxxxxxx>
- Date: Tue, 26 Feb 2008 14:56:38 -0800
Joel, controlled / high ESR caps are rare birds. Istvan has been
championing them for years nd some parts have been made. If you are
prepared to buy 100,000,000 at a shot you might get somewhere w/ the
manufacturers. But right now, most are running their lines to capacity
w/ commodity parts.
Regards,
Steve.
Joel Brown wrote:
> While we are all talking about bypass caps, I just got done reading a book
> by Bruce Archambeault called "PCB Design for Real-World EMI Control". In the
> book there is a chapter on bypassing and it shows measurements from actual
> test boards. In one case, a certain percentage of the caps are "high ESR"
> which seems to result in substantial damping (reduction) of the resonances.
> The high ESR caps are described as ceramic capacitors with a series resistor
> built into the package, I have been unable to find such a part. Has anybody
> found a benefit to this approach and a source for high ESR capacitors?
>
> Thanks - Joel
>
>
>
>
>
--
Steve Weir
Teraspeed Consulting Group LLC
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