warning in 130nm IBM cadence

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hello! can anyone help me step by step to design an LNA on 130nm IBM on cadence?I am designing for WLAn 11g at 2.4 GHZ and bandwidth is 167MHz.I have reached a cascode stage but getting warning like vgs-vbs is -2.74 exceeds lower limit -2.6.Can somebody suggest the reason of this warning and keep hepling throughout my design?
 


It's the limit of breakdown voltage of gate oxide, you can find it in design manual
 

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