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# assign 5 - Q 1 in active region b For R C = 500 W calculate...

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1 ECED3201: Introduction to Electronics Fall 2008 Dalhousie University, Department of Electrical and computer Engineering Assignments #5 1- Determined the voltages at the nodes B 1 , C 1 , E 1 , B 2 , C 2 , E 2 and the currents I E1 , I B1 , I C1 , I E2 , I B2 , and I C2 . Assume V BE1 = V BE2 = 0.7V and 1 = 2 =100. (Consider the npn BJT in active region if V BC < V BCon = 0.4V) +6V R C2 = 1k W Q 1 R E2 = 2.5k W +6V R E1 = 1k W R C1 = 1.2k W +6V R B1 = 3k W R B2 = 3k W Q 2 B 1 C 1 E 1 E 2 B 2 C 2 I B1 I E1 I C1 I B2 I E2 I C2 Fig. 1 2- Consider the circuit shown in Fig. 2. I S = 6.95×10 -16 A and = 100 for the npn BJT ( Q 1 ), V T =25mV and V CC = 5V . (Consider the npn BJT in active region if V BC < V BCon = 0.4V) R C Q 1 V BE V CC Fig.2

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2 a) For V BE = 0.7V, determine the maximum value of R C that permits the operation of
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Unformatted text preview: Q 1 in active region. b) For R C = 500 W , calculate the maximum value of V BE that permits the operation of Q 1 in active region . c) Consider now V BE = 0.7V and R C = 1k W . A small-signal v be is applied in series with V BE as shown in Fig. 3. Draw the small-signal equivalent circuit and find the small-signal voltage gain v o / v be . For v be = 0.004sin 1 t-0.001sin 2 t (V), calculate the expressions for the total instantaneous quantities v O (t), i C (t) and i B (t). R C Q 1 V BE V CC v O +-v be i C i B Fig. 3 Due date: October 21, 2008. Late submission will not be accepted....
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