From: Martin J Thompson ([email protected])
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?
<snipped for context>
>>> Larry Smith <[email protected]> 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
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