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Old 14th December 2010, 11:49 AM   #1
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Location: Burlington, NC
Default SemiSouth Spice models?

Just wandering if anyone has SPice models for any of the Semisouth fets. I would like to try using them in Pass SOX and BOSOZ. Evrything I have read about them (by Pass) says they are superior. So while i wait on parts for my first amp build(Aleph J), I would like to play with these gold plated JFets with no money down.
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Old 14th December 2010, 07:46 PM   #2
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They are still being developed by semisouth.
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Old 14th December 2010, 07:53 PM   #3
EUVL is offline EUVL  Europe
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Have you asked ?

Patrick


PS See Table 1 of :
http://www.semisouth.com/application...04_Merrett.pdf

.

Last edited by EUVL; 14th December 2010 at 07:56 PM.
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Old 14th December 2010, 08:03 PM   #4
knutn is offline knutn  Norway
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Default PSpice Model

I have made my own, using curve fitting:

.MODEL SJEP120 NMOS
+ LEVEL=3
+ L=2.0000E-6
+ W=150
+ KP=1.0014E-6
+ RS=10.000E-3
+ RD=27.968E-3
+ VTO=.94454
+ RDS=6.0000E6
+ TOX=2.0000E-6
+ CGSO=66.667E-18
+ CGDO=544.10E-15
+ CBD=1.1197E-9
+ MJ=.68177
+ RG=10.000E-3
+ IS=1.0000E-18
+ N=5
+ RB=1.0000E-9
+ GAMMA=0
+ KAPPA=0
*$
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Old 14th December 2010, 08:07 PM   #5
EUVL is offline EUVL  Europe
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Thanks a lot.

Patrick
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Old 14th December 2010, 09:00 PM   #6
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Quote:
Originally Posted by EUVL View Post
Have you asked ?

Patrick


PS See Table 1 of :
http://www.semisouth.com/application...04_Merrett.pdf

.
Yes. They told me they are still working on the spice models. They will be getting back to me when they are finished.
I have seen that pdf, but I am waiting on them to send me their official spice model.

Great work knutn. I will have a look at it.

Last edited by Melon Head; 14th December 2010 at 09:05 PM.
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Old 14th December 2010, 09:13 PM   #7
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Quote:
Originally Posted by EUVL View Post
Have you asked ?

Patrick


PS See Table 1 of :
http://www.semisouth.com/application...04_Merrett.pdf

.
I had also seen the table in the Semisouth datasheet, but it was incomplete in comparison to other models i had used and i am not informed enough to proceed otherwise. Thanks knutn for the model. Now i can just simulate destroying it. Interesting that the dollar sign came up in your measurements.

Last edited by buzzforb; 14th December 2010 at 09:23 PM.
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Old 15th December 2010, 03:42 AM   #8
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Quote:
Originally Posted by knutn View Post
I have made my own, using curve fitting:

.MODEL SJEP120 NMOS
+ LEVEL=3
+ L=2.0000E-6
+ W=150
+ KP=1.0014E-6
+ RS=10.000E-3
+ RD=27.968E-3
+ VTO=.94454
+ RDS=6.0000E6
+ TOX=2.0000E-6
+ CGSO=66.667E-18
+ CGDO=544.10E-15
+ CBD=1.1197E-9
+ MJ=.68177
+ RG=10.000E-3
+ IS=1.0000E-18
+ N=5
+ RB=1.0000E-9
+ GAMMA=0
+ KAPPA=0
*$
This modeled just as I expected. Thanks for knutn! I mean thanks Knutn!
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Old 6th March 2011, 07:10 PM   #9
lhquam is offline lhquam  United States
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Location: Olalla, Oregon: Land of the 100 Valleys
Quote:
Originally Posted by knutn View Post
I have made my own, using curve fitting:

.MODEL SJEP120 NMOS
+ LEVEL=3
+ L=2.0000E-6
+ W=150
+ KP=1.0014E-6
+ RS=10.000E-3
+ RD=27.968E-3
+ VTO=.94454
+ RDS=6.0000E6
+ TOX=2.0000E-6
+ CGSO=66.667E-18
+ CGDO=544.10E-15
+ CBD=1.1197E-9
+ MJ=.68177
+ RG=10.000E-3
+ IS=1.0000E-18
+ N=5
+ RB=1.0000E-9
+ GAMMA=0
+ KAPPA=0
*$

Those values for CGSO and CGDO are not believable. Does anyone have better values for these parameters? They are essential for predicting AC behavior and harmonic distortion components.
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Old 6th March 2011, 08:47 PM   #10
knutn is offline knutn  Norway
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Location: Oslo
Quote:
Originally Posted by lhquam View Post
Those values for CGSO and CGDO are not believable. Does anyone have better values for these parameters? They are essential for predicting AC behavior and harmonic distortion components.
No, you are right; I did not model these capacitances. If you take a look at the data sheet, you will see that Semisouth is specifying Ciss=670 pF, Coss=103 pF and Crss=97 pF at VDD=100V. My first try for the Spice model would be to set CGSO=Ciss=700E-12 and CGDO=Crss=100E-12 (Keep the bulk-drain capacitance CBD=1.1197E-9). Please, be aware that especially CGD increases when the drain-gate voltage decreases. I am afraid you will have to try to run Spice and change the values to comply with the data sheet values. Anyone who has any values from Semisouth?
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