20101ee115A_1_ee115a_winter10Hw7

20101ee115A_1_ee115a_winter10Hw7 - Figure 3 Problem 4...

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EE115A Frank Chang Winter10 Homework #7 Due: Never Problem 1. For the circuit shown in figure 1, assume that μ n C ox =200 μA/V 2 , and μ p C ox =100 μA/V 2 , V THN =|V THP |=0.2V. a) If W/L=20/0.25 and M 1 and M 2 act as current sources, what’s the required V B such that the sum of I x and I Y is 2mA? b) What is the relationship between the output resistances of M 1 and M 2 ? Figure 1. Problem 2. For the circuit shown in figure 2, assume that both devices are properly biased in their saturation regions and their λ’s identical. Furthermore, assume that the W’s and L’s for both devices are doubled a) What is the change in the voltage gain if the bias current remains constant? b) What is the change in the voltage gain if the bias current doubles as well? Figure 2.
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Problem 3. For the circuits shown in figure 3, calculate the voltage gains for both stages and explain which one of the topologies is preferred and why.
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Unformatted text preview: Figure 3. Problem 4. Assume λ does not equal to zero, obtain the voltage gain for each of the circuits shown in figure 4. Figure 4. Problem 5. For the circuits shown in figure 5, assume λ is not zero, find the R out . Figure 5. Problem 6. For the circuits shown in figure 6, assume λ=0, find the voltage gain. Figure 6. Problem 7. For the circuits shown in figure 7, assume λ is not zero, find the voltage gain. Figure 7. Problem 8. For the circuit shown in figure 8, assume that μ n C ox =200 μA/V 2 and V THN =0.4V. Furthermore, suppose that I 1 is 1mA, C is very large, R D =500Ω and λ=0 . a) What is the W/L such that the voltage gain is 5? b) What is the DC voltage drop across R D ? c) If R 2 is twice as large as R 1, What is the required R 1 and R 2 such that M 1 is 200mV into the saturation region? Figure 8....
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20101ee115A_1_ee115a_winter10Hw7 - Figure 3 Problem 4...

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