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q06 - ECE 3050 Analog Electronics Quiz 6 Professor Leach...

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ECE 3050 Analog Electronics Quiz 6 February 18, 2009 Professor Leach Name Instructions. Print your name in the space above. Honor Code: I have neither given nor received help on this quiz. Initials 1. The fi gure shows a BJT di ff amp. It is given that V + = +24 V , V = 24 V , R B = 150 , R E = 75 , R C = 24 k , R Q = 23 k , V T = 0 . 025 V , V A = , V BE = 0 . 65 V , β = 74 , I E = 0 . 5 mA , r e = 50 , r x = 30 , and r 0 e = 52 . 4 . r e = V T I E = 50 r 0 e = R B + r x 1 + β + r e = 52 . 4 g m = I C V T = 0 . 01973 S r π = V T I B = 3 . 75 k r 0 π = r x + r π + (1 + β ) R te r 0 = V A + V CE I C = r ic = r 0 + r 0 e k R te 1 α R te r 0 e + R te = Before starting the problem, note that the answers for some of the numerical calculations are given with the above formulas. (a) For v i 2 = 0 , solve for the small-signal Thévenin resistance R te 1 looking out of the emitter of Q 1 . (b) For v i 2 = 0 , solve for the small-signal voltage gain v o 1 /v i 1 . (c) For v i 1 = 0 , solve for the small-signal voltage gain v o 1 /v i 2 . If you are clever, it is possible to make use of the solution for v o 1 /v i 1 to simplify the numerical calculations.
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