how build second stage CMFB in op with Class-ab output st

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sethtalk

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title:
fig1.jpg is a two-stage hybrid cascode compensated ota with class-ab output stage
which is propose by Mohammad Yavari,2003;

the figure shows that the first stage CMFB control the M13 drain current,
but, i dont know how to buid second stage CMFB ,what device should be controled?
can anyoun tell me or give me a simplified schematic ?

very thanks to your help!
 

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