inverting PGA

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xy_283156
Level 2
Level 2

Hi,

   

im using a TIA and want to gain and invert that signal with a "inverting PGA". The gain works fine, but i cant invert the signal. No matter how i connect it or using a "PGA" or a "inverting PGA", the outputsignal is always negativ. I routed the signals via GPIO to an oscilloscope to opserve them. Whats wrong?

   

Thanks

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