HW4_soln

HW4_soln - Problem Set 4 Additional Problems 1. 2. (a) The...

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Unformatted text preview: Problem Set 4 Additional Problems 1. 2. (a) The drain and gate of M1 and M3 are connected. So you can think of the two transistors as nonlinear resistors. Then Ib is determined by the three resistors (M1, Rb, and M3). Now we have M1 and M2 current mirror, which means Ib of M1 is copied to Iout of M2. Depending on the size ratio of M1 and M2, Iout is proportional to Ib. ( ) 2 1 2 Tn gsn n n b V V L W K I = ( ) 2 2 2 Tn gsn n n out V V L W K I = => b n n out I L W L W I 1 2 = If 2 1 n n L W L W = , b out I I = (b) b out I A I = = 25 Assume, 20 , 10 = = p n L W L W = => = => + + + = => + + + + = => + + = k R R R L W C I V R I L W C I V V V R I V V b b b p ox p b Tp b b n ox n b Tn DD sgp b b gsn DD 126 10 25 16 . 3 18 . 16 . 10 25 5 . 1 5 2 2 6 6 (c) Since the circuit works as a current source,...
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This note was uploaded on 03/02/2009 for the course ECE 137a taught by Professor Staff during the Winter '08 term at UCSB.

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HW4_soln - Problem Set 4 Additional Problems 1. 2. (a) The...

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