E1practicesol - EXAM #1 - Solution Problem 1 (43 points)...

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1 EXAM #1 - Solution Problem 1 – (43 points) Both amplifiers have the following characteristics: A vo =40 R i =2k R o =4k Clipping levels: L= 12V (unloaded) (a) Redraw this 2 stage amplifier using the amplifier model. Make sure to label V 1 , V 2 , V 3 , and V L on the schematic. (15 points) (b) Find A v = . Express your answer as a ratio(V/V) and in dB. [Round to a whole number] (10 points) = A v . . . . R i1 R S R i1 A vo1 R i2 R o1 R i2 A vo2 R L R o2 R L R i1 = = 1 1 2k 1 2k 1 K R o1 = 4k+2k=6k A v = = . . . . 1k 1k 1k 40 2k 6k 2k 40 100 100 4000 4.878 (rounded = 5V/V ) or = . 20 log( ) 5 13.979 1k 2k 2k 100 V 1 V 2 V 3 v L V s v L V s 1k 2k 2k 100 V 1 V 2 V 3 2k 40V 1 40V 3 4k 2k 4k V L A vo1 V 1 A vo2 V 3 R i2 R o2 R L R o1 R s = R i1 i s i o
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2 (c) For the input V S as shown, sketch (make the peaks exact and estimate between the peaks) the output at V L on the graph below. (8 points) Amplitude => peak will be at: gain (from 1(b)) * Vs_peak=5*Vs_peak = 5(+1)=5 (d) Evaluate the overall current gain. ( ) [round to the nearest whole number and express as A/A].
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E1practicesol - EXAM #1 - Solution Problem 1 (43 points)...

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