This is the voltage gain of source follower at high frequency.
What I am confused here is why Cdb1, Cdg1 are not included in the pole of the transfer function?
Should it be Cgs2 + Csb2 + CL + Cdb1 + Cgd1 instead of Cgs2 + Csb2 + CL?
Thank you.
Yes. All the capacitances connected to output must be taken into count while calculating frequency response. They may be neglected because of their values.