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two stage op-amp - nmos or pmos input question
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arunsomanathan



Joined: 15 Jun 2009
Posts: 7
Post02 Jul 2009 11:04   

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.
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jerryzhao



Joined: 08 Oct 2005
Posts: 159
Helped: 19
Post02 Jul 2009 12:09   

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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