Question

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subscription 5. The PMOS transistor has Vtp=-1 V. If the voltages of three terminals are: Vg=2 V, Vs=5v, Vd=3.5V, then the transistor is operated in a) Cut off region b) Triode region c) Saturation region d) Unknown 6. The voltage transfer characteristic of a CMOS inverter is shown in Fig. 4. Threshold voltages Vrn = |Vpl = 0.5V. If Vpo=5V and the input v=3V, then Saved to this PC a) Both PMOS and NMOS in triode region b) Both PMOS and NMOS in saturation $v c) PMOS in triode region, and NMOS in saturation d) PMOS in saturation, and NMOS in triode 2.5 V TV 2.5v 5v Vi Fig. 4 II. (20 points) For the circuit in Fig.5, find the labeled node voltages Vi and V2. For NMOS transistors, kn=0.5 mA/V2, VT=0.8V, and 2=0 +5V 21 Fig.5

Answer 1

5) Solution Gate Voltage given Vi=-1V =) Threshold voltage Ver - eV; Source Voltage V5 = 5V; Drain Voltage VD = 3.5 V PMOS Vp => 3.50 @ if Verzivel =) PHOS is in Cutoff region So here 20 & 10 ) Hence it is a not in cutoff region. O if Ver >l Vep I & IVpl < Ves -I Vepl then davice 98 in linear region PV>IVV {ver >l Veply Ver Verl= 2-1-11=2-1=1, Ver-1 Vtpl-10 So No 1&ver-veel 3.5V 160 Hence it is not in Triode region ③ if Ver >Vtpl & VD > {ve-lvt 1} thes Saturation region 21-11een> lutely v § 3.5>10v { Up > Ven-1 Vtpiy Hence Prog transistor is operated in Saturation region So option c is correct. 2011