Question

INEL 4201 F-1920-1 SEC. [020] [040] NAME Ill (34 PTS.) A FET amplifier is shown below. (a) Determine gmt, gm2, ro1 and ro2. (b) Parameters: k'(W/L)=0.625mA/v2, A=0.01 v1, Tref=2000A. Decembe Vdd Sm1 = II TTT M2 Vout Iref 200uA M TY

Answer 1

Given Her kl W = 0.625 malv; 1-0.016, Inef = 200119. VG3 for H3 is equal to VsGz for M2, hence carrunt thorough M2 is same as Iref Iveco I MZ = Ini - Inref = 2000A. Small signal equivalent circuit Vi mister soros Vasili M2 is biased transistor load circuit From from the given Mz and a cosez I nef. gmi= 9m2 = 2/K Isa case! KEK' casezi kažk'ü 9mi. Ime = 2/444) Ida . Imi 9m2 = 2 / 2 (W) Isa -2/0.635X02 2 0.625*02 = 0. 5MAIN = 0.707 MAIV Imi = 9m2 = 0.707 malul n2 = 0.207 malv 19m, = 9me=0-5mAlv 5ooks. rol - Joz i Ina 0.01 X0.2 b) vo= agmi vgs (70, 11002) = -9mili (701172) case 1: M = 0.707mAIV Vo = -0.707(50011 500) vi - 176.75

Ao che = -176.75 VIVI case 2 • Imi = 0.5mATV. van - gmil rhoill 702) =-0.5 (500 11500) 5-125 How -125 VIV roi = ro2 =500kr