1. VDD M2 M1
Vbb
Vin CL RL Vo
VDD Vo
Vb2
Both share the same small signal model.
gm2 may include gmb2,
rds1 may include rp-source
Cs2 include all caps at S2

2. vg1/vin =1/(1+sRsaCgs1)
KCL at Vo:
KCL at Vs2:

3. ro  rds1*Av2 || RL
Av(0)  - gm1ro
p1 = - w-3dB = -1/roCout
GBW = gm1/Cout
z1 = +gm1/Cgd1
p2  -1/{(rds1|| rincg)Cs2}
p3  -1/RsaCgs1

4. Slew rate: the maximum rate at which a node voltage can change.
SR+: max ↑; SR-: max ↓
To compute: find max current, divide by total cap
VDD
VDD M2 vo
10m CL M1
Vin
Positive slew rate SR+ = I2Q/CLtot
Negative slew rate SR- = (I1max-I2Q)/CLtot
I1max can be very large when Vin is very large.
So, SR- is unknown but can be large.
From a desired SR+, we need I2Q = SR+ * CLtot
To accommodate parasitics: I2Q = SR+ * 1.2CLtot