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Problem of plotting (TI) log112 curve (Vo vs. I1/I2) (log112 model in file folder)

 

Hi, :


Here is a pure technical problem.

I had found a log amp model (TI) LOG112 at the file folder.

When I was trying to plot the "Vo vs I1/I2" curve mentioned in the datasheet, I can't work it out. The plot is unexpected.


I had uploaded the example file at?

20160801_log amp (TI) log112.zip


Thank you for any opinion

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