will this supply insensitive biasing work?

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Please elaborate your question, as the diagram is not correctly visible.
 

Based on my understanding, since the (W/L)s of both upper PMOS & lower HV NMOS are the same, the current-mirror structure makes the current running in each circuit branch be the same, which should be equal to IBP.

Then, we can get Vgs1+IBP*Rs= Vgs2. Therefore, we can get IBP=0.

It seems that this supply-insensitive biase generator could not work. Is there sth wrong with my deduction? could u point it out for me?



click the picture to show full size.

Thanks in advance!
 

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