Re: PCB Design

From: Ken Smith (kensmith_at_green.rahul.net)
Date: 08/09/04 

Date: Mon, 9 Aug 2004 19:59:44 +0000 (UTC)

In article <u5cfh05ts4doudr773s0smfvh75vkco1nf@4ax.com>,
John Larkin <jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:
[...]
>>Low inductance in the caps is imortant. Use small / wide caps, very short
>>traces and multiple vias.
>
>Not really. The planes are the real HF bypass, and the caps help out
>at low frequencies.

I disagree with this. I guess it depends on what you call low
frequencies adn how low of impedance is low enough. One common
consideration is not the operation of the circuit but the ripple in the
Vcc getting into some nearby Vcc powered analog circuit. 

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