Hi, I'm trying to find the resistance Rx in the picture.
Now, usually I would assume that (if channel length modulation is non-zero), that this would be 1/gm2 in parallel with ro2. However, I remember that was when our drain of M2 was connected straight to Vdd (AC ground in small-signal). But in this case, the drain is no longer just AC ground, Rd is there.
I'm assuming the Rx in this case won't just be 1/gm2 in parallel with ro2 will it?