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ro ~= 1/(\lambda * I_D), which is inversely proportional to width, no?
I think if you increase width of M3,-M4, gm1,2 stays the same, ro3,4 would decrease, gain would decrease but overdrive voltage and VSD,sat3,4 would decrease allowing a wider output swing.
Gert Cauwenbergh's wrote a book in the early aughts I believe called "Learning on Silicon." You should be able to find it at your local university library.
You should be able to use your thevenin and norton theory in order to figure this one out.
You can also conceptually separate your input into two separate inputs, and take advantage of the fact that there is no current across the 100 ohm resistor because the voltages on either side are...
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