Re: [SI-LIST] : ESR and bypass caps

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From: Ray Anderson (raymonda@radium.eng.sun.com)
Date: Fri Feb 04 2000 - 12:40:05 PST


Doug-

        I ran your first test scenario from Appendix 1 in your paper
under Hspice.
        
        L C R
        10.0nH .100uF .00001
         1.0nH .010uF .00001
          .1nH .001uF .00001
          
          (10 each of each capacitor value.)
          
          
          From the spice simulation I get the following results:
          
          FREQ IMPEDANCE (ohms)
          5.04MHz 2.62e-5
          15.3MHz 39.8
          50.4MHz 2.62e-5
          165 MHz 20.6
          504 MHz 2.62e-5
          
          
          There is quite a discrepancy in the amplitude of the anti-resonance
          peaks:
          
          Yours: 4003 ohms Mine: 39.8 ohms
          Yours 3936 ohms MineL 20.6 ohms
          
          I've attached the graphic results of the spice run along with
          the little spice deck I used to create it. Any idea why we are
          seeing such a delta between the spice run and your numerical
          calculations?
          
-Ray Anderson
Sun Microsystems



Decap Tool Decoupling Simulation (Version 3)
*** (Single-Node Analysis) ***

****************circuit***************

i1 caps 0 ac=1

xcap1 caps 0 cap1
xcap2 caps 0 cap2
xcap3 caps 0 cap3

.subckt cap1 1 5
l 1 2 10nH
c 2 3 .1uF
r 3 4 .00001
rdum 2 3 10meg
vsense 4 5 0
fmult 1 5 vsense 9
.ends cap1

.subckt cap2 1 5
l 1 2 1nH
c 2 3 .01uF
r 3 4 .00001
rdum 2 3 10meg
vsense 4 5 0
fmult 1 5 vsense 9
.ends cap2

.subckt cap3 1 5
l 1 2 .1nH
c 2 3 .001uF
r 3 4 .00001
rdum 2 3 10meg
vsense 4 5 0
fmult 1 5 vsense 9
.ends cap3

***************************spice control*****************************
.options probe list node post=1 ingold=2

.ac dec 500 1X 1G
.probe ac v(caps)
.end

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