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Ass7 - ECED3201 Introduction to Electronics Fall 2009...

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1 ECED3201: Introduction to Electronics Fall 2009 Dalhousie University, Department of Electrical and computer Engineering Assignments #7 Problem 1 - [9 points]: We wish to analyze the amplifier shown in Fig. 1. Assume the transistor Q 1 has =100, and assume V BE = 0.7V for the dc analysis. Also consider V BCon = 0.4 V, V A = ( r o = ). Assume R B = R B1 + R B2 =2k , R C = 2k , R S =500 , R L =2k , V CC = 5V and V 1 = 3V. R C v i v O V CC Q 1 R L + - R B1 R B2 R S V 1 i R B1 (t) i R B2 (t) i RL (t) i RC (t) Fig. 1 a. [3 pt] Find the dc currents I B , I C and I E . Verify that Q 1 is operating in active region. b. [3 pt] Set R B1 =r and calculate the small signal gain A v = v o / v i (Note: use the hybrid- model). c. [3 pt] For v i (t)= 0.01sin 1 t (V), calculate the expressions for the total instantaneous quantities i C (t), v C (t) and v O (t) and the expressions for total instantaneous current in the resistors R B1 , R B2 , R L , and R C (labeled as i R B1 (t), i R B2 (t), i R L (t) , and i R C (t) respectively). (Hint you will find I C = 2.1mA, R B2 = 0.81k , and v C (t) = 0.76 + 0.2x sin 1 t ) Problem 2- [5 points]: We wish to analyze the amplifier shown in Fig. 2. Assume the transistor Q
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