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In Fig. 4(a) and (b), VDD = 3.3 V, I1 = 10 μA, (W/L)3 = (W/L)4 = (1/0.1). Fig. 4( b) represents the I−V characteristic of the cascode current source formed by M3 and M4. (a) Determine (W/L)1 and (W/L)2 so that IA = 40 μA and VA = 2.2 V. Ignore the channel length modulation. (10) (b) Using small-signal analysis, determine the output resistance of the cascode current source when λp = 0.1/V.

In Fig. 4(a) and (b), VDD = 3.3 V, I1 = 10 μA, (W/L)3 = (W/L)4 = (1/0.1). Fig. 4( b) represents the I−V characteristic of the cascode current source formed by M3 and M4. (a) Determine (W/L)1 and (W/L)2 so that IA = 40 μA and VA = 2.2 V. Ignore the channel length modulation. (10) (b) Using small-signal analysis, determine the output resistance of the cascode current source when λp = 0.1/V.

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In Fig. 4(a) and (b), VDD = 3.3 V, I1 = 10 μA, (W/L)3 = (W/L)4 = (1/0.1). Fig. 4( b) represents the I−V characteristic of the cascode current source formed by M3 and M4. (a) Determine (W/L)1 and (W/L)2 so that IA = 40 μA and VA = 2.2 V. Ignore the channel length modulation. (10) (b) Using small-signal analysis, determine the output resistance of the cascode current source when λp = 0.1/V.

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