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If both stages have active loads and require CMFB, you have 2 solutions :
1-Either to design a CMFB network for each stage and use it to bias its active loads .
2-Or use only one CMFB network to adjust the common mode of the second stage and use the output of the CMFB to bias the active loads of the first stage,thus, you'll need only one CMFB network .
Note that the CMFB loops must be stable .
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