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Unformatted text preview: 1 ECED3201: Introduction to Electronics Fall 2009 Dalhousie University, Department of Electrical and computer Engineering Assignments #6 Problem 1 - [4 points]: The circuit below is designed for a collector current of I C =1mA. Assume = 100 and I S = 6.9510-16 A, and V BCon = 0.4V for the npn BJT ( Q 1 ). Q 1 +5V R E = 200 W R C = 2k W +5V R 2 = 10k W R 1 Fig. 1 a) Determine the value of R 1 and verify the operating region of Q 1 . b) If R E deviates by +5% from its value of 200, find the new value of the collector current . Problem 2 - [5 points]: In the circuit of Fig.2, V C = 2V, V BE 0.7V and V BCon = 0.4V. If V CC = 5V, R C = 3 k W , and a signal v be = 0.005sin t volts is applied: a) Find the expressions for the total instantaneous quantities i C (t), v C (t), and i B (t). The transistor has = 100. b) What is the voltage gain? Fig.2 2 Problem 3 - [5 points]: You want to use a PIC microcontroller to drive a motor in a clockwise direction at either...
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