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

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From: Martin J Thompson (Martin.J.Thompson@trw.com)
Date: Wed Aug 16 2000 - 23:57:41 PDT


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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