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CMOS OP-AMP with Impossible Specs to meet?

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akula1488

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0.18 um
1.8 vdd
input CM 0.4~1.4V
output swing 0.25~1.55V
open loop > 60 dB
unit gain frequency 2 GHz

any ideas which topology I should try?
3 stage op-amp with multi path nested miller comp?

thanks
 

Hi,
Why 3 stage? It's compensation is not easy to handle. I suggest two stage with a folded cascode in the first stage for it's input CM. If you hadn't need the 1.3 V output swing you could have reached the specs (e.g. the easy 60dB gain) with only one stage.
 

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