Problem 1: (8 points) A source follower is shown below. Please (1) draw the ac-equivalent circuit (4 points) (2) show that the ac-voltage gain ( A_{v} riangleq rac{v_{o u t}}{v_{i n}}=rac{g_{m} R_{s}}{1+g_{m} R_{s}} ) (where, ( g_{m} ) is the transconductance; ( R_{s} ) is the equivalent resistance of ( left.R_{L} | R_{S} ight) ) (4 points).

Problem 1: (8 points) A source follower is shown below. Please (1) draw the ac-equivalent circuit (4 points) (2) show that the ac-voltage gain A, V Vin 8R = 1+8 R resistance of RRs)(4 points). (where, gm is the transconductance; R, is the equivalent DD