Discussion 06 Solution - EE 2001 Discussion 6 Solution...

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EE 2001 Discussion 6 Solution Clipper Circuits a) Add two elements to the partial circuit below to limit the output voltage to -15 volts to +10 volts. (Assume 0.6 volt forward diode drop and label all component values.) b) If V IN can range from –20 volts to +20 volts, calculate R so that the current in the clipper branch does not exceed 10 mA. c) Repeat part b with a 1 k Ω resistor placed across the output. Solution: a. Use two face-to-face zener diodes in series, that is, they should be pointed opposite directions. One should be a 9.4 V zener and the other should be a 14.4 V zener. b. Worst case is when Vin = +20 and Vout = +10. That puts 10 volts across the resistor. To limit the branch current to 10 mA, set R to (10V)/(10mA) = 1000 ohms. c. Test extremes: If, Vin = +20; Vout = 10; Iz = 10mA; I output resistor = (10V)/(1000 ohms) = 10mA; Then, R = (10V)/(20mA) = 500 ohms If, Vin = -20; Vout = -15; Iz = 10mA; I output resistor = (15V)/(1000 ohms) = 15mA; Then, R = (5V)/(25mA) = 200 ohms Use most restrictive case. R = 500 ohms + V IN _ + V OUT _ R
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Rectification Circuits
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