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Anyone know of any gain non-linearity with AD842 when used as a summer driving 100ohms when between -2V to -8V output?

Question asked by mvinger on Aug 11, 2016
Latest reply on Aug 15, 2016 by JinoL

I am using the AD842 as a summing amp for 3 sources and it drives into 102.5ohms...

The gain non-linearity only happens when the output is between -2 and -8V and has a crossover where the gain is OK again around -6.0 to -6.1V.

The appears with a max of either a + or - 0.25 to 0.30 volts of offset within the non-linear region.

I have attached a schematic (PDF) - the load of 102.5 ohms is not shown.

Thank you.