Exam%202%20Solutions - EE338K Quiz 2 Dec 1,2009 Y4 NAME 1...

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Y4- EE338K Quiz 2 Dec. 1,2009 NAME: 1. The Bode plot below shows laGro)1 and / a(jro) for an Op Amp that is internally compensated to be unity gain stable. If that Op Amp is used in the given feedback circuit find the Phase Margin. C=l,",F R=lkQ ~I 11----+-----'\1\ Es6 (-) . + - r------- .......... - a(s)(E" -E-) .. ~ .. -.--- ~ Op Amp Model 100 III 80 ct .JJ 60 . - U 40 O al 20 o , ....... 3 -20 44 a -40 -60 -80 I I ~ .~ I ~ I~ .~ I~, ~ I'" ~ .. ~ 1\ J\ I I I I I I I I RAD 10- 2 10- 1 1 10 1 10 2 10 3 10 4 10 5 110 6 10 7 10 8 I~\I SEC -1/ '1\ I I I I I I I I I 90 VI QJ ~ 0) -90 Q) o I -180 ~1-270 - -360 -450 o _ ... I I I I \ \ I 1 \ \ I ~I \ \ ,~ i \ \ I ~ !~ \ .~ 1\ 1\ ~ \ \ 1\ \ \ \ l~ \ \ '" \ I" \ " 1
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2JA. EE338K 2 Dec. 1 2009 2. The magnitude and phase of the uncompensated I-LGm)1 for the feedback circuit below are given in the accompanying plots. Determine the largest value of mc that will compensate the circuit for +90 0 Phase Margin and sketch the compensated I-LGm)1 and I-LCjm) curves. (+) • ~s )(E+ - E- }u c ~. ~ (s +mJ --~ ........... ~ . -:!:- Op Amp Model 120 100 80 rLJ :1.1 - 60 ,.Q ..... (.,j :1.1 40 ~ I 20 ,-, S 0 0 ~ -20 -40 -60
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