Hi,
there are a lot of issues ... or maybe i don´t understand how you expect it to work.
* no power supply and no power supply capacitors. Yes, I know that some simulation run without them, but a real circuit will have problems..
* No naming of the parts makes it difficutl to discuss a circuit.
* 100uF directly connected at the ouput of the most right OPAMP. Usually OPAMPs are not made to drive that large capacitance.
* non_inverting input to most right OPAMP is named with "1V ref for shifting".
But it is not 1V, it rather is "PIN3_DAC / 5" --> it shifts with PWM.
* RE input has no ESD protection.... it´s easy to kill the OPAMP by handling of the electrodes.
* while CE and WE are less prone for ESD problems, I still recommend to add ESD protection.
* lower_LT1097 has no local feedback. You risk oscillation and noise pickup.
* add capacitors to the DC nodes to stabilize them and reduce noise.
The overall function is not clear to me.
Klaus