Re: Parametric sweep of model implementation

Jim Thompson wrote:
> On 28 Apr 2005 04:55:11 -0700, klauskvik@xxxxxxxxxxx (Klaus Kragelund)
> wrote:
>
>> Hi
>>
>> I´m using PSpice Capture 10.3
>>
>> One of my simulations on a SMPS I´m using a BJT as a switch
>> transistor
>>
>> I would like to do a parametric sweep on the circuit with two
>> different BJTs models (lets say the transistors are BC547 and 2N2222)
>> to determine the optimum choice of transistor
>>
>> My method sofar is to use two global values in the parametric sweep
>> (1 and 2). Then in the position of the BJT there is a subcircuit
>> with the two BJTs with both transistors in parallel with resistors
>> on all connections
>>
>> The value of the resistors is determined by an IF command, that when
>> the parametric value is 1 one set of resistors is 1mOhm and the other
>> set 1Meg and vice versa.
>>
>> But this is a cumbersome method. The optimal would be that Pspice
>> would allow the implementation name to change according to the needed
>> model but that feature is not available
>>
>> So the question, do any of you guys have a better method for this
>> problem?
>>
>> Thanks
>>
>> Klaus
>
> Klaus,
>
> There is no provision for a library change in PSpice. HSpice does it
> with their .ALTER command.
>
> HSpice actually reruns the simulation with changes as stated in the
> .ALTER.

This is interesting. I would have though PSpice would implement
something similar to what is in In TISpice, it uses rerun cards

..Reruns
statments
..Rend

You just make a file with as many reruns as you like, with each rerun
specifying various parameters and libraries. SS does this for
parameters, but not lib, so to change a model in this way, one would
have to set each parameter of the model in a rerun. SS can generate this
automatically.


>
> I've done it by concatenating .CIR files using an ordinary text
> editor. I've been known to concatenate as many as 32 different
> library corners into one simulation.

Oh dear..SuperSpice does this all within the GUI...
http://www.anasoft.co.uk/WCSETUP.GIF

All plots of all runs are all automatic.

>
> Maybe I can convince the oldest son, the programmer, to write me
> another utility :-)

Or have a look at another simuater:-)


Kevin Aylward
informationEXTRACT@xxxxxxxxxxxxx
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.


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