differential apmplifier problem

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jutek

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hello

could you tell me what max gain i can achieve from circuit like this in the picture but with PMOS as the inputs and NMOS as a load?

i'm trying to simulate that with different currents and W/L ratios but the max i've achieved is 10V/V

What is incorrect? my expectations or calculations?

regards
 

probably 10 is the correct number. the gain is Gm(nmos)/Gm(pmos).
 

the gain is not big

because the output pmos is diode connect.

so the output resistance is small
 

nxing said:
probably 10 is the correct number. the gain is Gm(nmos)/Gm(pmos).
Click to expand...

so, if i want to build 2 stage opamp i have to use another input stage to have much more gain?

regards
 

you can refer Allen's book ,chapter 6,Cmos operational amplifiers.
 

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