MT test W09 (1) - Electronics II(ELEC 312 Winter 2009 class...

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Electronics –II (ELEC 312), Winter 2009 class Mid-term test (March 6, 2009) ( Time: 45 minutes Instructor: Dr. R. Raut) Student ID# Name: Q.1: Consider the amplifier in Figure 1, built with MOS transistors. The transistor M3 functions as an active load for the transistors M1 and M2. M1 is a common source stage while M2 is a common gate stage. (a) Draw the small signal ac equivalent circuit for the system. Ignore the body effect for M2. (b) Set up the nodal admittance matrix for the system with a goal to find the small signal voltage gain v o /v i . You DO NOT have to find the voltage gain. Figure 1: Q.2: Figures 2(a)-(b) show the cascode and the Wilson current mirror using NMOS transistors. The bias currents are set as I REF = I o = 20 micro amp. Given that V A =20 volts, K n =100 micro amp./V 2 , W/L =10, g m = L W I K BIAS n 2 , g mb = 0.2g m , compare the output resistances that the two mirrors present to an outside circuit. The theoretical expressions for the output resistances are:
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