... I don't understand what I should put in practice where there are Iref1, 2 and 3, as the circuit is "cut".
I have to determine ro for every transistor to compute the stage gain the analytic way, but I don't know my lambda (and so I don't know the devices' VA). Is there any alternative way to do it, without such parameter? The only possible "solution" I have came up with is to simulate MOS' characteristics and then, by using two points on the graph, to compute VA, but I doesn't seem like a feasible (accurate) solution to me.
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