[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
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

-------------------Legal  Disclaimer---------------------------------------

The above electronic mail transmission is confidential and intended only for 
the person to whom it is addressed. Its contents may be protected by legal 
and/or professional privilege. Should it be received by you in error please 
contact the sender at the above quoted email address. Any unauthorised form of 
reproduction of this message is strictly prohibited. The Institute does not 
guarantee the security of any information electronically transmitted and is not 
liable if the information contained in this communication is not a proper and 
complete record of the message as transmitted by the sender nor for any delay 
in its receipt.


To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
or at our remote archives:
Old (prior to June 6, 2001) list archives are viewable at:

Other related posts: