# hw4 - ECE 422/522 Homework#4(Due Nov 2 Fall 2010 1 a Design...

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ECE 422/522 Fall 2010 Homework #4 (Due Nov. 2) 1. a) Design a simple MOS current source of the type shown in Fig. P1(a) to meet the following constraints: (i) The transistor must stay in saturation for values of V out to within 0.4 V of ground. (ii) The output current must be 50 μ A. (iii) The minimum value of the output resistance must be 2M Ω . Make M1 and M2 identical. You are to minimize the total device area within the given constraints. Here device area will be taken to be the total gate area (WxL product). V DD = 3V, V TO =0.7V, k = 100 μ A V 2 , and 1 λ L = 20 V m μ . Use Spice to verify results with the Level 1 model. b) What is the output resistance of the designed current source if the BSIM3 MOSFET model is used to simulate the design? Use the MOSFET model parameters from the class web page. c) Design the MOS current source of the type shown in Fig. P1(c) to meet the constraints of (i) and (ii) above, but the output resistance must now be 100 M Ω . Make all devices identical except for M4 and assume γ = 0.

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