crutschow,
Thanks for the reply. When I tried to measure offset voltage, my Aux op-amp is saturating. Can you please share any circuit which i can try on bread board. Any link which will give me detailed idea.
Maybe you should first tell us what your servo circuit will be used for, what are the voltages and so on. Or at least post a schematic of the actual setup.
What is U5 supposed to do? You have the inputs connected with two 100 ohm resistors and no feedback so the output will saturate just due to the input offset being amplified by the open-loop op amp gain.
The second stage is an integrator with no reset circuit so that will also go to saturation due to input bias current.