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

About this list Date view Thread view Subject view Author view

From: S. Weir (weirsp@a.crl.com)
Date: Fri Mar 24 2000 - 18:48:55 PST


The series capacitor equation applies if you measure the capacitance of the
two outer plates, d_eff = 2d

-------G
   d
   ---V
   d
-------G

Since these are at the same potential, ( DC anyway ), that equation isn't
of much practical value for this situation. Charge stores on the inner
side of each plate, so C_total = 2C.

Regards,

Steve.

At 02:54 PM 3/24/2000 -0800, you wrote:
>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
>>

**** To unsubscribe from si-list or si-list-digest: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Apr 20 2000 - 11:35:54 PDT