Hi.
I have 2 problems:
1) I am using OPA2277U.I have a problem about offset. It's an integrator non-inverting. In inverting i have 7500K (7M5) and 750 (G=10000).In parallel of 7500K i have 100nf.If i put the + input to ground, i find an output of 2V instead a maximum of 200mV. 2) the output doesn't drive correctly a mux ADG1608: i see with a sine signal sawtooth profile in the negative part.
in attached the schematic
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Thanks in advance
Mario.