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orcad layout - convergence

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ultrasoundguy2

Bioengineer
Jul 1, 2014
28

I would like to add a multiplication element to an orcad capture simulation.k
ideally any frequency mixer IC model could be better than this element..

i can put in two DC signals and get a proper scaled output
however, i get convergence problems when I stimulate it with an AC signal
Ill attached screen shots of all 3 conditions in one file.

ive tried reducing the tolerance of the calcuations (middle in image) by 3-4x with no luck

 
 http://files.engineering.com/getfile.aspx?folder=87e5576c-b7dc-40f1-b032-2fc1097d1fa3&file=forum.png
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