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ETEE3211 Fall 2004 Test #1 Name:__________________ Show all work. Clearly indicate final answer(s). 1. (15 points) A silicon diode is placed in a circuit and is operating at 85oC. At 25oC the diode has a 0.68V drop. What is the voltage drop of the diode when in the circuit? 2. (25 points) For the circuit shown to the right, sketch (and explain clearly) the output voltage waveform vout when the input voltage (vs) is a 100Vrms sine wave. Use VON=0.7V and Rf=0. 3. (30 points) Determine the value of the capacitor needed to provide filtering for the circuit shown so that the voltage does not drop below 12V. Assume Rf=0 and VON=0.7V. Sketch the output waveform. 4. ( 30 points) The zener regulator shown uses a 20V zener diode to maintain a constant 20V across the load resistor, Rload. If the input voltage varies from 32V to 42V and the load current varies 200mA to 400mA, select the value of Ri to maintain the constant voltage across the load. Determine the power rating required for the resistor and the zener diode. Extra Credit: (25 pts maximum) Assuming no loss in the rectifier diodes of the full-wave rectifier shown below, and with n=2, what is the value of Ri needed to maintain Vload at 16V with a load current of 500mA? Vs varies between 110 and 120Vrms at 60Hz. The minimum voltage to the regulator may reflect a ±4V ripple. Assume VZ=16V and RZ=0. Determine the size of the capacitor and the value of the resistor required.