From: Ray Anderson ([email protected])
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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