set09new - ECE3050 Homework Set 9 1 The f gure shows the ac...

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Unformatted text preview: ECE3050 Homework Set 9 1. The f gure shows the ac signal circuit of a BJT di f erential ampli f er. It is given that V T = . 025V , β = 99 , r x = 30 Ω , I E = 1 . 5mA , R B = 1 . 5k Ω , R E = 50 Ω , R C = 12k Ω , and R Q = 10k Ω . To simplify the problem, assume that that r = ∞ . (a) Show that r e = 31 . 967 Ω . (b) Show that the Thévenin equivalent circuits seen looking out of the emitters in the ac signal circuit consist of the voltages and resistances v te 1 = 0 . 992 v s 2 , v te 2 = 0 . 992 v s 1 , and R te 1 = R te 2 = 131 . 3 Ω . (c) Use the emitter equivalent circuits on the simpli f ed T model to show that i e 1 = ( v s 1 − . 992 v s 2 ) / 163 . 267 and i e 2 = ( v s 2 − . 992 v s 1 ) / 163 . 267 . (d) Use the collector equivalent circuits of the simpli f ed T model to show that v o 1 = − 72 . 764 v s 1 + 72 . 173 v s 2 and v o 2 = − 72 . 764 v s 2 + 72 . 173 v s 1 ....
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This note was uploaded on 05/25/2011 for the course ECE 3050 taught by Professor Hollis during the Summer '08 term at Georgia Tech.

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set09new - ECE3050 Homework Set 9 1 The f gure shows the ac...

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