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2. (36% ) In Fig. 2, the device parameters and (W/L) ratios for Q1-Q3 are given below (WIL), 2 (W/L)2-2 (W/L); (a) (10%) If IREF-2nA, find VD3 and VS3 and verify if Q3 is in saturation. Ignore the channel length modulation for DC analysis. Note: DC Vc30 (b) (12%) Draw the small signal circuit for the complete +10 V amplifier. Based on the circuit, derive the AC voltage gain vo/vi in terms gm, ro and RD (please use appropriate subscripts to clearly distinguish the MOSFET AC parameters, such as 8m2, o, etc.). Also estimate the value of the gain. Assume Cs is large. You need to include the channel modulation effect. (c) (9%) If Cs is removed from the circuit, what will the REFLR voltage gain become? (d) (5%) From (a) and (b), if vi-0.1V sinwt is applied the Q2 input, what is the total output voltage you will observe in an oscilloscope? Assume the distortion is negligible. If you cannot get the values in (a) and/or (b), just assume the values in (a) and/or (b), and answer the question Fig. 2 +10 V

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