(a) An enhancement n-MOS transistor has the following parameters: Threshold voltage VTh = 0.8 V, K′ = 20 μA/V2 = μnCox, where μn is mobility of electron, Cox gate oxide capacitance. (i) Find W/L ratio for gate voltage VG = 2.8 V, drain voltage, VD = 5 V, source voltage VS = 1 V and drain current ID = 0.24 mA. [6 marks] (ii) Calculate drain current ID for gate voltage VG = 5 V, drain voltage VD = 4 V, source voltage Vs = 2 V [4 marks] (b) For the n-channel EMOSFET used in circuit below, threshold voltage VTh = 1 V, K = 0.3 mA/V2. Find (i) V0 (as shown in figure below) [6 marks] (ii) If V0 = 2 V, find the new K value [4 marks] Fig. 3
![(a) An enhancement n-MOS transistor has the following parameters: Threshold voltage VTh = 0.8 V, K′ = 20 μA/V2 = μnCox, where μn is mobility of electron, Cox gate oxide capacitance. (i) Find W/L ratio for gate voltage VG = 2.8 V, drain voltage, VD = 5 V, source voltage VS = 1 V and drain current ID = 0.24 mA. [6 marks] (ii) Calculate drain current ID for gate voltage VG = 5 V, drain voltage VD = 4 V, source voltage Vs = 2 V [4 marks] (b) For the n-channel EMOSFET used in circuit below, threshold voltage VTh = 1 V, K = 0.3 mA/V2. Find (i) V0 (as shown in figure below) [6 marks] (ii) If V0 = 2 V, find the new K value [4 marks] Fig. 3](https://www.doubtrix.com/uploads/editor/2184158082cIJVKbTciD.png)
![Q6. For the amplifier circuit shown in Fig. Q6, the MOS Transistor Ml has the following parameters: Kn = 1 mAV−2, and VTHN = 1 V. MOS transistors M2 and M3 are identical and have the following parameters: Kp = 1 mAV−2, and VTHP = −1 V. Fig. Q6 (a) Perform the DC analysis of the amplifier circuit shown in Fig. Q6, and show that the DC gate voltage of Ml is 5 V. You need to explain briefly your answer. (b) Calculate the value of RS such that the drain current of MI is 4 mA. Verify that the Ml is operating in the saturation region. [ Ans: Rs = 0.5 kΩ] (c) Calculate the parameters, gm and ro, of the small-signal model of the transistor Ml. [Ans: gm, M1 = 4 mAV−1, and ro, M1 = ∞ ] (d) What is the configuration of this amplifier? (e) Calculate the values of Rin , and Rout . [Ans: Rin = 5 kΩ and Rout = 2 kΩ ] (f) Estimate the voltage gain, Av( = vout /vin ). [ Ans: AV = −1.78]](https://www.doubtrix.com/uploads/editor/9864219624emwVzDjyOi.png)
