Hi!
Has anybody a ref to some kind of "practical guide" how to
create a bjt spice model when a datasheet is available only?
Thanks!
Andrew
Has anybody a ref to some kind of "practical guide" how to
create a bjt spice model when a datasheet is available only?
Thanks!
Andrew
Anli,
This could be a nice place to start:
http://bwrc.eecs.berkeley.edu/Classes/IcBook/SPICE/UserGuide/elements_fr.html
/Hugo 🙂
This could be a nice place to start:
http://bwrc.eecs.berkeley.edu/Classes/IcBook/SPICE/UserGuide/elements_fr.html
/Hugo 🙂
Hugo,Netlist said:
LTSpice has the same info in it's doc already 🙂 But (at least for me) it is
impossible to do something useful from such brief bjt model description :-(
Andrew
Yes I know, its a lot of studying.
Not being an EE myself there's not much to understand from these weird parameters.
/Hugo 🙂
Not being an EE myself there's not much to understand from these weird parameters.
/Hugo 🙂
anli said:
If you're an EE, a very good text for this is "Semiconductor Device Modeling with SPICE" by Massobrio and Antognetti. It's described here: http://www.amazon.com/exec/obidos/t...f=sr_1_1/104-2023120-7803914?v=glance&s=books
There's a lot of theoretical info in there, so it's probably not appropriate for a non-EE.
Failing that, if you know somebody that has PSPICE (the commercial version, not the student version), it contains an extraction program that simplifies the problem. The extraction programs seem to be pretty buggy though. For instance, the OnSemi MJL3281a and MJL1302a parameters were extracted by a program called MODPEX, which is supposed to be pretty fancy. But almost all the extracted parameters are totally wrong.
Andy_c, I'm not an EE :-( I have thought there is some guide in terms lke:
"...
n). parameter XYZ. Look at xyz datasheet diagram, take values at
the begining of this graph, use them in this formula, ..., OK, you have
got the XYZ parameter.
n+1). parameter XZZ. For the most of models may be set to ...
n+2). parameter ...
..."
Andrew
"...
n). parameter XYZ. Look at xyz datasheet diagram, take values at
the begining of this graph, use them in this formula, ..., OK, you have
got the XYZ parameter.
n+1). parameter XZZ. For the most of models may be set to ...
n+2). parameter ...
..."
Andrew
Andrew,
My opinion is, if you only concern the DC operation, your BJT model should be extracted easily. It means you need to define what information you want before the modelling. For example, only DC operation point? Only AC analysis for frequency response? Transient response for switching action.
I hope it helps
Scottie
My opinion is, if you only concern the DC operation, your BJT model should be extracted easily. It means you need to define what information you want before the modelling. For example, only DC operation point? Only AC analysis for frequency response? Transient response for switching action.
I hope it helps
Scottie
Hi,
you can find aticles about modeling diodes, BJT, JFET at his address Modeling from Datasheet in the section documentation Modeling from datasheet dedicated to PSpice OrCAD.
Daniele
you can find aticles about modeling diodes, BJT, JFET at his address Modeling from Datasheet in the section documentation Modeling from datasheet dedicated to PSpice OrCAD.
Daniele
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