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Folded Cascoded Opamp

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alifathi

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Hallo
I have desigend a folded cascoded op amp work at very high frequancy 1Ghz
with .13micro technology.and it gives good resultes but if i change the baise voltage just 1 mv Ex (700m to 699mv) the output CM level changing completley is that normal.if not do anybody know what is the problem.I didnot add CMFB circuit yet.
 

if it is fully differential OPAMP , u need to add the CMFB to stabilize ur operation but the 1 mv is very strange

khouly
 

without CMFB, the output CM voltage is changed with the input voltage, it it normal
 
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