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TI's spice models and Mentor

George50083
Prodigy 10 points
Other Parts Discussed in Thread: OPA657

Hi,

I try to simulate an analog desing using TI's OPA657 spice model on Mentor MGC Analog Designer (2004 version).

It doesn't work. The error report say:

--------------------------------------------------

.param x10={x2*5}
a.spi(318):  error -- {x2 is not a valid floating-point number.

I_I2         @N_0002
a.spi(325):  error -- not enough nodes specified for device i_i2.

I_I1         @N_0011
a.spi(334):  error -- not enough nodes specified for device i_i1.

I_I3         @N_0017
a.spi(337):  error -- not enough nodes specified for device i_i3.

vbase.exe:  error -- terminated after 4 errors.

--------------------------------------------------

It seems model is done using different version of spice. What can I do?

Thanks in advance,

Giorgio

  • 0
    TI__Mastermind 40295 points

    Giorgio,

    From the error messages in your posted message, it appears the application cannot tolerate the variable assignment in the .PARAM statement, or the $ symbols in the node names.

    A modified, preliminary Spice model has been uploaded to accompany this post. The changes from the original Spice netlist are given in the header comments.

    A quick summary of the changes: the variable in the .PARAM statement has been replaced by the equivalent numerical value, and the $ symbols have been removed from the node names.

    I am not familiar with the details of the application you are using, so I will have to do some additional research  The posted model may provied a quick solution, so in the mean-time, please feel free to try this preliminary Spice model and let me know any comments you may have.

    Thank you for bringing this to our attention.

    Regards,

    John

    opa657_pspice_model-c.zip