Equivalent model used for diode in simulation softwares

diode model used??

hi,

wat is the model, that is, equivalent model used for diode in the simulation softwares??? ex. pspice... and moreover for perfect modeling of a simple diode i came to know that there are more than dozens of parameters to be considered... is there any model existing for a diode( which is supposed to be the simplest of all devices), which completely models the diode... exactly takin into account the carrier life time, depletion capacitance, diffusion capacitance, inbuilt voltage, differences of forward and reverse bias... and more parameters like this? and if it exists.. then wat abt BJT and FETs and other devices.... also it is said that the "h parameter" itself can depend on more than a 100 parameters... in that case how will u get a perfect equivalent model.. atleast considering all the parameters? the models developed doesnt have all the parameters even taken into account i suppose... what do u say?

regards,
arunmit168.

Re: diode model used??

Spice has default built in models that are used if you do not specify one. The best thing to do is to use the models available on vendor's web sites. The next best thing is to use the models for specific diodes in the spice model library.

Re: diode model used??

flatulent said:

Spice has default built in models that are used if you do not specify one. The best thing to do is to use the models available on vendor's web sites. The next best thing is to use the models for specific diodes in the spice model library.

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how to find out the model used by spice??/

regards,
arunmit168.

Re: diode model used??

The built in default models are described in books on spice or possibly the documentation that came with your program. You can find the details of the library models by examining the library with a text editor. You can also make a simple circuit for a simulation and the text output of the simulation will list the model details. This text output is usually called name.out where name is the name you give to the simulation. You may have to put some commands in the .options line to list the model. In pspice the listing is the default and you have to use a command in the .options line to not output the model details.