ece hw4b - 1 University of Massachusetts Department of...

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1 University of Massachusetts Department of Electrical and Computer Engineering ECE 323 Electronics I Fall 2010 Problem Set 4: Small-Signal Models and MOSFETs Do all the problems below. Turn in those labeled with * From Sedra and Smith: problems 5.116* and 5.112(assume beta = 100, find vc/vi and Rin) Problem 1* : MOSFETs can be used in many of the same circuits in which bipolar transistors are used. In this problem you will analyze the circuit below much as the equivalent bipolar transistor circuit was analyzed in discussion. Model the MOSFETs with k n ’(W/L)=0.5mA/V 2 , V tn =1V, λ =0. Figure 1a: More Simple Transistor Circuits A) Find the DC operating points for the circuit in Fig. 1a. Redraw the circuit labeling all node voltages and currents. Be sure to test any assumptions you make. B) Make a small signal model of the circuit in Fig. 1a and calculate the small signal gain v out /v in . Figure 1b: Circuit for Calculating r
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ece hw4b - 1 University of Massachusetts Department of...

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