I hope I analyzed correctly its gain (for small AC signal). My small-AC-signal-circuit is attached in the bottom of this post). However, I don't understand its purpose. What is the advantage of concatenating two mosfets this way? i.e.
- Does it allow us to raise (or attenuate) the gain without effecting Rin and Rout?
- Does it allow us to reduce (or raise) VDD without effecting the resistances or currents or gain?
- Does it allow us to change the values of Rs1, Rs2?
- Also, I hope I get correct Rin and Rout. Can I say that Rin=(R1||R2) and Rout=(r_ds2||R2)?
I tried to run these scenarios in my head but I didnt manage to come with any satisfying explanation to any of the scenarios.