QUESTION 11 _ 5'?

QUESTION 4

Consider the circuit shown in Figure 5, and assume that

R1 = R2 = 5MΩ RS =RD =RL =4kΩ, VDD = 12V, Rsig = 1kΩ

and the transistor has the following constants,

k'n W/L = μ nCox W/L = (15/40) mA/V2, Vt = 1V

(a) Using DC analysis, and assuming that λ = 0, calculate the following DC voltages and currents:

VD, VS, and ID

(b) Let λ = 0.01 V-1. Calculate gm and ro

(c) Draw CLEARLY and PRECISELY the AC small-signal equivalent circuit for the whole circuit

indicating the small-signal equivalent circuit of the transistor.

(d) Calculate the AC small-signal voltage gain ratio : AV = vo / vi

(e) Calculate the AC small-signal input resistance : Rin = vi / ii

(f) Calculate the overall small-signal voltage gain : Gv = vo / vsig

(g) Calculate the AC small-signal current gain : Ai = io / ii

(h) Calculate the output resistance Rout seen by the load resistance