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AD8605 4 level filter can't work

Hello, I design a 4 level filter in accordance with the online design wizard of ADI, as follows, but, it finds that the second level is output 0V. Why?  how to adjust and test?


Single power supply 4V;

VREF = 2V;

The first stage output 5mV sine wave, offset +10mV;

The second level output is 0.

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