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AD8605 4 level filter can't work

shang32 在 2018-7-18 詢問的問題
最後回覆由shang32於2018-7-21提供

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?

U1:AD8605;

Single power supply 4V;

VREF = 2V;

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

The second level output is 0.

結果