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Ass1 - I D3 I D4 for R 1 = 50kΩ R 2 = 40kΩ R 3 = 20kΩ R...

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1 ECED3201: Introduction to Electronics Fall 2009 Dalhousie University, Department of Electrical and computer Engineering Assignments #1 1- For the circuits shown in Fig. 1 using ideal diodes, find the values of the voltages and currents indicated. Fig. 1 2- In each of the ideal-diode circuits shown in Fig.2, v I is a 1-kHz, 10V peak sine wave. Sketch the waveform resulting at v O . What are v O positive and negative peak values? Fig. 2 3- Assume a constant-voltage drop model with V D = 0.7V for each diode in the circuit in Fig.3. Find the current through each diode and the voltage at each node. (a) Complete the table shown below by all the possible operating states for the diodes when the resistances R 1 , R 2 , R 3 , and R 4 are not specified. Use “ ON ” to indicate that a diode is conducting and “ OFF ” to indicate that a diode is non - conducting. (Hint: check if one of the diodes is always ON or OFF to simplify the table).
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2 (b) Find the diode currents, I D1 , I D2
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Unformatted text preview: , I D3 , I D4 for R 1 = 50kΩ, R 2 = 40kΩ, R 3 = 20kΩ, R 4 = 40kΩ. Fig. 3 4- An electrical engineering student has lost his 2.1-V cellphone charger and couldn’t find an adaptor with output less than 3 V. He then decides to put his knowledge of electronics into action and constructs the circuit shown in Fig. 4, where three identical diodes in forward bias produce a total voltage of V out = 3V D 2.1V at T=300 o K and R sustains the remaining 900mV. Neglect the current drawn by the cellphone for the sake of simplicity. (a) Determine the diode saturation current, I s , so that V out =2.1V. Assume n=1. (b) Use the iterative-analysis procedure to compute V out at T=300 o K if the adaptor voltage, V ad , changes to 3.2V. (c) Repeat (b) with the aid of a small-signal analysis. R = 150 Ω +-Cellphone Adaptor I D V ad = 3V I cell 0 +-V out Fig. 4 Due date: September 24, 2009 at 1:00pm. Late submission will not be accepted....
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