[SI-LIST] Decoupling a IC
- From: "Juan Manuel" <jtalavera@xxxxxx>
- To: "si list" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 3 Mar 2003 18:20:00 -0000
Hi all!!
I'm trying to decouple a component with 9 outputs and 3 power pins and 500ps
of rise time ( so, I need decouple the component until 700MHz). I'm
following the typical process of set a Target Impedance, decouple low
frequencies with a bulk capacitor and decouple High frequencies with ceramic
capacitors.
My problem is that When I calculate the induction budget to determiante the
number of ceramic capacitors ( following the Black Magic Book, formula 8.18
: L(tot)=X(max)Tr/3.1416 ), the value is very small: 160pH for a 500ps of
rise time and 1 ohm of target impedance. Therefore I should put 7 capacitors
in parallel. I think that putting seven bypassing capacitor for a small
component is insane. any solution?
Thanks in advance
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