Transistor modeling - how do I generate P-Spice Parameter ? - diyAudio
 Transistor modeling - how do I generate P-Spice Parameter ?
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 27th December 2009, 06:01 PM #1 diyAudio Member     Join Date: Jul 2005 Location: D-55629 Schwarzerden Transistor modeling - how do I generate P-Spice Parameter ? I need articles and books, where I can find more informations about this in general. Particularly by old devices (e. g. germanium transistors like AD148, AD161/162 or AC128) but unfortunately even by some currently types (MJE340/350 or 2N/2SC/2SA series) unfortunately there are either nothing or unreliable values only available. Thank you very much for your suggestions
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Join Date: Aug 2006
Location: Texas
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This is the best I can manage for now:

Quote:
 The BJT default in ISSPICE4 gives first order, Ebers-Moll, DC parameters; but it does not provide parameters for Transient or AC analysis. The following default can be used when minimal data sheet specifications are available by using the PARAM program to evaluate the equations in curly braces. This model will create a good transistor model from virtually any data sheet. The parameters you must specify are: IMAX Maximum collector current COB Collector-base capacitance FT Gain bandwidth product in Hz TS Storage time The equation-based model is shown below: .MODEL NBJT NPN (CJC={2.2*COB} TF={.16/FT} TR={1.7*TS} +CJE={7*COB} RC={.5/IMAX} VAF=100 IKF={.7*IMAX} + IS={2E-15*MAX} ) This subcircuit-based macro model makes use of the default model parameters so that it is not permissible to change default values without reevaluating the parameters which are given here.
And if you want it more precise:

Improved SPICE Models for MJL3281A and MJL1302A - Section 3

- keantoken
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 27th December 2009, 11:51 PM #3 diyAudio Member   Join Date: Oct 2009
 27th December 2009, 11:55 PM #4 diyAudio Member     Join Date: Aug 2006 Location: Texas Blog Entries: 2 Wiki page: Models and Modeling Aides - diyAudio - keantoken __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!
 28th December 2009, 12:30 AM #5 diyAudio Member   Join Date: Oct 2009 tiefbassuebertr, what do you want to create with transistors out of bamboo?
 28th December 2009, 12:34 AM #6 diyAudio Member     Join Date: Aug 2006 Location: Texas Blog Entries: 2 Fuzz pedal maybe? - keantoken __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!
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Quote:
 Originally Posted by tiefbassuebertr I need articles and books, where I can find more informations about this in general.
The best book I know of on this subject is by Massobrio and Antognetti titled Semiconductor Device Modeling with SPICE.

 28th December 2009, 09:45 AM #8 diyAudio Member     Join Date: Jul 2005 Location: D-55629 Schwarzerden Very interesting informations - thank you very much to all. Danhard: "out of bamboo" - what means this ?? Please note: my colloquially english is very bad.
 28th December 2009, 12:15 PM #9 diyAudio Member   Join Date: Oct 2009 It is joke, germanium transistors made of bamboo wood Sorry, my English is directly Zero.

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