su10q04

su10q04 - ECE 3050 Analog Electronics Quiz 4 June 16, 2010...

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ECE3050Ana logE lectron icsQu iz4 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 βR te R tb + r π + R te +( R tb + r π ) k R te The f gure shows a BJT di f amp. Given: I Q =2mA , V T =25mV , β =99 , α =0 . 99 , V A = ( r 0 = ). R B =1 . 2k , R E = 163 ,and R C =18k . (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 =20k ?A s sum e I E does not change.

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su10q04 - ECE 3050 Analog Electronics Quiz 4 June 16, 2010...

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