Re: [SI-LIST] : Parallel Plate Capacitance for Bypass

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From: Chris Padilla (cpad@cisco.com)
Date: Fri Mar 24 2000 - 15:25:39 PST


Ah, it was the ground planes being connected that was
tickling my "engineering" sense in the back of my mind.

Is that <gasp> intuition? :)

Thanks----->Chris

At 03:13 PM, you wrote:
>
>The capacitance doubles because you have the capacitance
>of the power plane to the top ground in parallel to the
>capacitance of the power plane to the bottom ground.
>
>Ctotal = Cpg1 + Cpg2
>
>------------Ground 1-----------
> |
> === Cpg1
> |
>------------Power-------------
> |
> === Cpg2
> |
>-----------Ground 2-------------
>
>
>Of course all this assumes that ground 1 and ground 2 are
>solidly stiched together with lots of low Z vias.
>
>
>-Ray
>
>
>
>>
>> This sounds very much like two caps in series to me so the value would
>actually
>> go down by 1/2 assuming the er and h are the same for both caps. Somehow,
>> though,
>> this doesn't *feel* right to me. I think I am missing something here.
>>
>> ----->Chris
>>
>>
>>
>> >
>> >
>> > 2. If you have a power plane sandwiched between 2 ground planes, does the
>> > parallel plate capacitance double for a given area?
>> >
>> > Thank you,
>> > Chris Hansen
>> > Sr. Design Engineer
>> > DPT & Adaptec Companies
>> >
>>
>>
>
>
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