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4902C2002exam1

# 4902C2002exam1 - Name ECE Box Problem Score Points 1 2 3 4...

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1 Name _______________________ ECE Box # _____________ Problem Score Points 1 ______ 30 2 ______ 30 3 ______ 20 4 ______ 20 EE4902 C2002 Analog IC Design Exam 1 This is a closed book test ! • Show all your work. Partial credit may be given. If you think you need something that you can't remember, write down what you need and what you'd do if you remembered it. Look for the simple, straightforward way to solve the problem for the level of accuracy required . Don't get entangled in unnecessary algebra . You may assume all op-amps to be ideal, except as otherwise noted. As in real life, some problems may give you more information than you need. Don't assume that all information must be used! It's your job to decide what's relevant to the solution. You have until 12 noon to complete this exam. There are four problems on a total of 13 pages.

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3 V GS G D S + - I D V DS < V eff TRIODE V GS < V tn OFF I D V DS INCREASING V GS I D- V DS CHARACTERISTIC (ACTIVE REGION) I D- V GS CHARACTERISTIC V GS > V tn ACTIVE V GS < V tn OFF I D V GS V tn CIRCUIT SYMBOL TRIODE REGION V SG G D S - + I D ACTIVE MOSFET LARGE SIGNAL CHARACTERISTICS N CHANNEL P CHANNEL D = (V GS - V tn ) I 2 μ n C ox 2 W L [1 + l n ( V DS - V eff )] V GD + - V GD + - V DS - + V SD - + V DS > V eff ACTIVE V eff D = (V SG + V tp ) I 2 μ p C ox 2 W L [1 + l p ( V SD - V eff )] V eff D = [ (V GS - V tn )V DS - ] I 2 μ n C ox 2 W L V DS D = [ (V SG + V tp )V SD - ] I 2 μ p C ox 2 W L V SD V SD < V eff TRIODE V SG < -V tp OFF I D V DS INCREASING V SG V SD > V eff ACTIVE V SG > -V tp ACTIVE V SG < -V tp OFF I D V GS V tn G D S I D G D S I D B B

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4 1. For each circuit configuration, indicate i) the operating region of the MOSFET: cutoff, triode, active ii) indicate the dopant type (n or p) in the source, body, and drain regions by writing "n" or "p" in the box in each region on the cross-sectional view of the MOSFET iii) sketch the distribution of mobile charge (if any) in the channel under the gate, and indicate if the charge is holes or electrons [10] a) Operating Region: CUTOFF TRIODE ACTIVE
5 [10] b) Operating Region: CUTOFF TRIODE ACTIVE [10] c) Operating Region: CUTOFF TRIODE ACTIVE

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