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[SOLVED] output common mode feedback of differential output amplifier

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greenjuice

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I'm making folded cascode amplfier and common mode feedback circuit to bias output level.

If i make output common mode level 1.75, then each my amplifier output is always almost 1.75v ,not average of two output level without changing my input voltage level.

is my structure not right?

i attach my circuit

Thank you.

http://obrazki.elektroda.pl/4856419500_1468469468.png
 
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shahbaz.ele

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dear your question is not clear.
The schematic you attached is not readable also.
you can use bias in other way like using supply of op-amp and potentio at input.
 
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