RE: [SI-LIST] : Decoupling capacitors (again!)

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From: Larry Miller (ldmiller@nortelnetworks.com)
Date: Thu Aug 17 2000 - 13:51:49 PDT


Twenty milli-ohms. 0.02 ohm. At 100 MHz. How does one measure such a
curiosity?

Thanks,

Larry Miller
(Not the other Larry)

> -----Original Message-----
> From: Martin J Thompson [SMTP:Martin.J.Thompson@trw.com]
> Sent: Wednesday, August 16, 2000 11:58 PM
> To: si-list
> Subject: RE: [SI-LIST] : Decoupling capacitors (again!)
>
> Larry, another question on buried capacitance...
> What is it about Hadco's material that allows you to get 2mils separation?
> Can this not be achieved with straight FR-4?
>
> Thanks,
> Martin
>
> <snipped for context>
> >>> Larry Smith <Larry.Smith@Eng.Sun.COM> 16 August 2000 23:55:52 >>>
> It turns out that the spreading inductance of power planes
> spaced 4 mils apart will give you roughly 20 mOhms at 100 MHz. We are
> using Hadco 'buried capacitance' planes that are 2 mils apart in many
> of our products to get lower impedance.
>
>
>
>
> TRW Automotive Advanced Product Development,
> Stratford Road, Solihull, B90 4GW. UK
> Tel: +44 (0)121-627-3569
> mailto:martin.j.thompson@trw.com
>
>
>
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