set16new - ECE3050 Assignment 16 1. The gure shows a VBE...

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ECE3050 — Assignment 16 1. The f gure shows a V BE multiplier. (a) By writing a single node equation at the base node of Q 1 , show that I 1 = I B + V BE R 2 = V = V BE μ 1+ α R 1 R 2 + I 1+ β R 1 Hint: Consider the emitter node to be the datum or zero voltage reference node and use I B = I C β = 1 β ( I I 1 )= 1 β μ I V V BE R 1 (b) If β →∞ , show that the answer for part (a) is the same as the one derived in class. (c) For a given I and I 1 , show that R 1 = V V BE I 1 and R 2 = V BE I 1 I/β (d) For V T =25mV , I S =7 . 5 × 10 15 A , β =99 ,and I =5mA ,so lv efo r R 1 and R 2 if V =2 . 4V and I 1 =0 . 1 I .An sw e r s : R 1 =3 . 44k , R 2 =1 . 49k . (e) Calculate the new values of R 1 and R 2 if the base current in the BJT is neglected. Answers: R 1 =3 . 44 k , R 2 =1 . 36k . (f) Repeat part (d) for I 1 =0 . 9 I .An sw e r
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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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set16new - ECE3050 Assignment 16 1. The gure shows a VBE...

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