RE: [SI-LIST] : Thin Power Plane Dielectrics

Ingraham, Andrew ([email protected])
Tue, 19 Oct 1999 09:29:16 -0400

Do these techniques use only different dimensions (perhaps with a higher
breakdown potential), or is the dielectric constant bigger as well?

I have seen warnings about "buried capacitance" layers that use high-Er
materials. While this is OK at lower frequencies, the advantage falls apart
at higher frequencies because the propagation delay through the buried
capacitance layer is more. Even though the capacitance per unit area is
large, the capacitance per nanosecond (risetime) may not be.


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