Re: [SI-LIST] : How do you use buried capacitance?

ajmani@us.ibm.com
Fri, 11 Jun 1999 13:10:44 -0600

Buried capacitance can be substituted for high-frequency discreet decoupling
capacitors. I have seen that it lowers the emissions at higher frequencies.
But, you will still require distributed discreet capacitors on the board in
order to shift the resonance caused by the buried capacitance. The behavior of
the board should first be simulated, and later verified on the actual board with
a network analyzer.

Regards, Ravinder

Email: ajmani@us.ibm.com
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"Chris Bobek" <cbobek@cadence.com> on 06/11/99 10:17:27 AM

Please respond to si-list@silab.eng.sun.com

To: si-list@silab.eng.sun.com
cc: (bcc: Ravinder Ajmani/San Jose/IBM)
Subject: [SI-LIST] : How do you use buried capacitance?

I understand the priciples behind buried capacitance. What I don't
understand is how you use it when designing a board.

Is it only used for decoupling?

How do you figure out how much decoupling capacitance it is equivalent to
for a particular IC?

Do you use it along with your standard decoupling capacitors (for added
effect)?

Thanks,

Chris

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