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su10q04 - ECE 3050 Analog Electronics Quiz 4 Professor...

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ECE 3050 Analog Electronics Quiz 4 June 16, 2010 Professor Leach Name Instructions. Print your name in the space above. Honor Code: I have neither given nor received help on this quiz. Initials Formulas: g m = I C /V T , r π = V T /I B , r e = V T /I E , r 0 = ( V A + V CE ) /I C , G m = ( R tb + 1 /g m + R te ) 1 , r ib = r π + (1 + β ) R te r ie = R tb + r x 1 + β + r e r ic = r 0 μ 1 + βR te R tb + r π + R te + ( R tb + r π ) k R te The fi gure shows a BJT di ff amp. Given: I Q = 2 mA , V T = 25 mV , β = 99 , α = 0 . 99 , V A = ( r 0 = ). R B = 1 . 2 k , R E = 163 , and R C = 18 k . (a) Solve for the numerical expressions for the small-signal output voltages v o 1 and v o 2 as functions of the input voltages v i 1 and v i 2 . (b) What would be the expressions if the tail supply has a small-signal resistance R Q = 20 k ? Assume
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