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Opa2350 negative half of voltage

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MarkF:
You have an inverting configuration with a fixed voltage of 1.57V at the +In of each op-amp
With a gain of 1K / 20K = 0.05



What are you expecting?  Surely, you want to have some gain?
I still think you should use my previously posted circuit.
What are the voltages at RP1 and RP2?  What is the max voltage you expect across these resistors?

MarkF:
The circuit you have is probably NOT what you think it is?
Look at it redrawn.

Zero999:

--- Quote from: Midgard on September 02, 2019, 04:48:38 pm ---Wouldn't be affecting a Bias current error?

--- End quote ---
The OPA2350 has a bias current of just 0.5pA typical, 10pA maximum and will cause an additional offset voltage of under 10nV, with an input resistance of 1k in parallel with 20k, which is tiny compared to the input offset voltage of 500µV.

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