1.	To find the voltage transfer characteristic (vo versus vi) for the circuit shown in Fig. 1, assuming that the diodes are identical and have Vγ (cut-in) = 0.6V and Rf = 0. (20%)
2.	For the modified VBE-multiplier circuit shown in Fig. 2, assuming negligible base current, (20%)
	(a)	To describe Vo as a function of VBE, VZ, R4 and R5.
	(b)	To find R4 for Vo = 7.2V, where VBE(on) = 0.7V, VZ=5.3V and R5 = 1KW.
3.	Fig. 3 shows a three-stage amplifier in which the stages are directly coupled. Assume that all capacitors (C1, C2, and C3) are sufficiently large to act as perfect short circuits at all signal frequencies of interest. (30%)
	(a)	Find the dc bias current (IC& IE) in each of the three transistors. Also find the dc voltage at the output, Vo. Assume |VBE| = 0.7V, β= 100, and neglect the early effect.
	(b)	Find the input resistance and the output resistance.
	(c)	Use the current-gain method to evaluate gain Vo/Vi
4.	(a)	Draw a circuit schematic for a pseudo-NMOS inverter. What are the advantages and the disadvantages of this circuit compared to a complementary CMOS inverter? (5%)
	(b)	Design a pseudo-NMOS inverter that has equal positive and negative capacitive-driving output current at Vo = VDD/4 for use in a system with VDD = 5V, |Vtp| = Vtn = 0.8V, k’n = 3k’p = 75 µA/V2, and (W/L)n = 1.2 m m/0.8 mm. What is the value of (W/L)p ? (10%)
5.	Use the feedback method to find the voltage gain Vo/Vs for the inverting op amp shown in Fig. 4. Let the op amp have open-loop gain m =  104, Rid = 100kW, and ro = 1kW. (15%) (Hint: shunt-shunt type feedback)

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