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# assign 2 - ECED3201 Introduction to Electronics Fall 2008...

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ECED3201: Introduction to Electronics Fall 2008 Dalhousie University, Department of Electrical and computer Engineering Assignments #2 1-. Consider V DD =3V, v (t)=0.01sin t, and R=1.5k in the circuit shown in Fig. 1 Assume that the diode has a 0.7V drop across when the ac signal v (t) is reduced to 0. Fig. 1 a. Find the dc current in the diode. b. Find the ac resistance of the diode (consider n=1). Assume the diode is at room temperature (V T 25mV). c. Write mathematical expressions (function of time) for the total current i D (t) through and voltage across the diode. d. What are minimum and maximum values of the current through the diode? 2- Design a 7.5 V zener regulator circuit, shown in Fig. 2, using a 7.5 V zener specified at 12 mA. The zener has an incremental resistance r Z = 30 and I ZK = I Zmin = 0.5 mA. The regulator operates from a V + =10 V supply and has a load R L = 1.2 k . Fig. 2

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a. What is the value of R so that V o =7.5 V b. Find the line regulation ( v o / v + ) c. What is the regulator output voltage when the supply is 10% high? and is 10%
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