DenisMark said:How I can see ur pmos input transistors work in triode regione (Vds too low). It seems something is wrong in ur circuit or in testbenches.
U should to bias input pair in saturation region, ever they need to work in weak inversion (sub-threshold, |Vgs-Vth|<=-50mV). In weak inversion Gm=Id/(n*Vt), n=1.3..1.5, Vt=kT/q. So futher increase of Gm is only achivable with Id increasing.
tirnanog said:As DenisMark has already asked: What is your common mode input voltage?
If this is too low then devices M1 & M2 would be out of saturated region and acting just as switches with low output impedance giving you low gain.
DenisMark said:U must provide me operation point information regarding M1,M3 and voltages at their terminals to resolve ur primary problem.
tirnanog said:What is the dc voltage that is being applied at the gate of M1 and M2?
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