ece hw5 - Don’t forget to use r o in your small signal...

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1 University of Massachusetts Department of Electrical and Computer Engineering ECE 323 Electronics I Fall 2010 Problem Set 5 Do all the problems on this problem set, but turn in only problems 1, 2, 3. Throughout this problem set model the transistors with: K n =0.75mA/V 2 , K p =0.75mA/V 2 , V TN =1.2, V TP =-1.2, and λ =0.03 unless specified otherwise. Problem 1: Analyze the current mirror in Fig. 1 for R=5k Ω . Figure 1: Simple Current Mirror A) Solve for I out . Over what range of V out will the current mirror operate properly. B) Solve for the output resistance of the current mirror. Problem 2: Figure 2: Active Load with Resistive Feedback A) Calculate the ratio of R 1 to R 2 in Fig. 3 that will set V out to 5V. Assume R 1 , R 2 are very large. B) Set R 1 to 100k Ω and set R 2 using the ratio calculated in part B. Calculate the input resistance. C) Using the component values from part B, calculate the gain of this circuit.

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Unformatted text preview: Don’t forget to use r o in your small signal model. 2 Problem 3: For the circuit below, choose values for I D , V G and R D such that (i) the loaded voltage gain (including R L ) is maximized and (ii) the allowable voltage swing on the drain is maximized. To do the latter, V D must be half way between the maximum that v D can be before cutoff and the minimum that v D can be and still keep the FET in the saturated region. Problem 4: Figure 2: Directly Coupled Common Source Stages A) Given I D,1 =I D,2 =1mA, calculate the gate voltages of each of the transistors. B) Calculate the value of R 1 . C) Calculate the gain from the input to the gate of the p-channel MOSFET. D) Calculate the value of R 2 such that the gain from v in to v out is 10....
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ece hw5 - Don’t forget to use r o in your small signal...

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