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two stage op-amp - nmos or pmos input question

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arunsomanathan

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two stage op-amp

I was just wondering in a two stage opamp suppose the first stage is nmos input why do we always use pmos input in the second stage or vice-versa. Can't we use nmos or pmos input in both the stages.
 

two stage op-amp

"nmos input why do we always use pmos input in the second stage or vice-versa" the second input mirror the current of the first stage's output in DC point.
"Can't we use nmos or pmos input in both the stages." I never do it. maybe it work, but DC point setup is not easy. The input and output range may be limited. you can try and simulate it.
 
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