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How to design a 1.8V operational amplifier

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lordfire

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i can't get all the mos working in saturation region, acquiring overdrive>200mV, when cascoding it.
 

It depends on your structure and it will be very difficult to design it with, say telescopic opamp, but with two-stage opamp, I think it's still viable. Also, the bias opoints have some effects on it.
 

try bulk source driven input structre
 

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