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Here are some observations concerning your circuit:
1) The positive power supply is grounded and connected to Vref. However, it looks like the input is +3V. In order to input a positive input signal you need a positive supply voltage. I suggest adding a +5V supply and grounding the reference pin.
2) There is nothing connected to VIN+. Therefore the output of amplifier A2 will be undetermined and therefore operation will be undetermined. I recommend connecting VIN+ to a potential.
3) Please ensure the amplifier is operating linearly. Please refer to the following FAQ:
