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Please, help to understand CMOS amplifier circuit

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tinker1965

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Here is what appears to be some sort of a folded cascode amplifier, but does not really match with any classic text book example. Does it make sense to you guys?
Amp.jpg
 

Are you sure the transistors on top, connected to Vdd are really NMOS, especially that "current mirror"?
 
You are probably right, n-channel transistors should all go to GND and p-channel to Vdd, so I must have it backwards except for the photo diode which should be reverse biased
 

Actually power is correct, but all the p-channel transistors should be n-channel and vice versa.
 

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