Let's consider this circuit:
Razavi makes the large signal analysis in the ideal case, that is with an ideal current generator. He shows that Ic1, Ic2, Vout1, Vout2 and (Vout1 - Vout2) are function of only the difference (Vin1 - Vin2), as shown in the following image:
Question: in a more realistic circuit (that is, with a real current source with a resistor in parallel), how would large signal analysis modify? How would the previous graphs change?