Question

Homework 4 ELEN 3445 6) For the NMOS devices in Figure 6 below, assume that k',(W/L)= 2 mA/V?, i=0, and V1 =1V. tlov tlov Voz vozu /42 Voit HB m2 Vs27 Init Ioad &22 64A OV - lov Figure 6. Circuit for Problem 6. a) Determine Vai, VDI, Vsi, Vasi ( = VG1 - Vsi), Ipi, and Voni (ie, the on voltage of device M1). In which mode is device M1 operating? b) Determine VG2, VD2, Vs2, Vos2, Ip2, and Von2. In which region is device M2 operating?

Answer 1

+10V 1 1/2 Vsa In teen D 4MA Given th (W) = 2m Alva 420) Via FIV. is in saturation (a) Assuminy Iva=orl Mi . input loop the KVL around O- Vs, + ID, --10=0. ► = Ķ In, - Vsi tlo. In: I (vsi to) ID; = 1.5 Vsi +15 - 0 =

and we have ID = 2 kn ( 4 / 4] (vas, vx)² To, = $ * 2x 10-2* [- VS -17% + 1.5 V5, +15= 10-? [Vsi ti ja = 1.5 Vsi +15 10-? Vs +5+ 2 vs,] 1500 Vs, + 15x102= Vs + 2 Vs, ¢ =D Vsi - 1498 vso - 14,999 =0 solving above eqh we get Vsi = 1507.95 + which is not valis T .-9.95v | Vas, = 9.950 cand I VONI = Vasi - Vt = 8.85v ID, = 1.5(-9195)+15 .: ID: 75 mA Vo = 10- Io, (3) ,: Voi = 9.975 V Yos,> Vas, - vt = M, in in naturation.

(6) VQ2 = VD, = 9.975V ID2=4 MA Assuming Me is in naturation, Ip, = { x kan en ) ( vasa -V)2 => 405 { * 2x10-3 *19.975 - Vsz -1]? => 4046 = (V52 + 8.925)? aa

VS2 + 8.975 = { 2 VS2 =-6.975 v 1 = VS2 = -10-975 which is smce not valid Uss = -lov. Vasz = 9.975 +6.975 VON2 = 15.950 Verse = 16.95 V Vos, = 9 +6.975 Tvosg= 15.975 v/ > Vona * M₂ is in saturation,