BJT spice model from datasheet - HOW TO?

anli · 28th January 2005, 01:58 PM

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

Netlist · 28th January 2005, 02:05 PM

Anli,
This could be a nice place to start:
http://bwrc.eecs.berkeley.edu/Classe...ements_fr.html

/Hugo

anli · 28th January 2005, 02:19 PM

Quote:

Originally posted by Netlist
Anli,
This could be a nice place to start:
http://bwrc.eecs.berkeley.edu/Classe...ements_fr.html

/Hugo

Hugo,

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

Netlist · 28th January 2005, 02:28 PM

Yes I know, its a lot of studying.
Not being an EE myself there's not much to understand from these weird parameters.

/Hugo

andy_c · 29th January 2005, 01:02 AM

Quote:

Originally posted by anli
Has anybody a ref to some kind of "practical guide" how to
create a bjt spice model when a datasheet is available only?

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/tg...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.

anli · 29th January 2005, 10:44 AM

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

scottieman · 30th January 2005, 06:11 AM

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

studio2100 · 21st June 2011, 09:01 AM

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

28th January 2005, 01:58 PM	#1
anli diyAudio Member Join Date: Oct 2004	BJT spice model from datasheet - HOW TO? 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

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28th January 2005, 02:05 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Anli, This could be a nice place to start: http://bwrc.eecs.berkeley.edu/Classe...ements_fr.html /Hugo

28th January 2005, 02:28 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	Yes I know, its a lot of studying. Not being an EE myself there's not much to understand from these weird parameters. /Hugo

29th January 2005, 10:44 AM	#6
anli diyAudio Member Join Date: Oct 2004	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

30th January 2005, 06:11 AM	#7
scottieman diyAudio Member Join Date: Jan 2005 Location: Hong Kong	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

21st June 2011, 09:01 AM	#8
studio2100 diyAudio Member Join Date: Feb 2011	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

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