buddypoor
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Yes, if everything is fixed - except the opamp type - then, indeed, the opamp seems to be the only part to be "optimized" - whatever this means. May I remember you, that - in addition to more or less classical sources of non-linearity - sometimes slew induced distortions exist. That means, you could try to use opamps with a higher slew rate. I suppose, you have already checked the different signal levels the various opamps have to accept (saturation effects). Thatīs all I can say at the moment. Good luck.
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