EE331HW5solutions - EE-331 Devices and Circuits 1 Prof. R....

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ON OFF OFF +10V +5V 0.0V -5V 8.2k 12k 10k (-0.25V) (+5.45V) (+9.35V) 475 µ A I = 0 I = 0 ON ON OFF +10V +5V 0.0V -5V 3.3k 6.8k 2.4k (-0.65V) (+6.08V) 0.99mA 0.99mA 1.81mA 0.82mA I = 0 (a) (b) 475 µ A4 7 5 µ A Problem 3.77 using a constant voltage drop diode model with V on = 0.65 V: ON ON OFF +10V +5V 0.0V -5V 8.2k 12k 10k (0.0V) (+5.94V) (+10.0V) 495 µ 9 5 µ A5 0 0 µ A 5 µ A I = 0 ON ON OFF +10V +5V 0.0V -5V 3.3k 6.8k 2.4k (+6.73V) 0.99mA 0.99mA 2.08mA 1.09mA I = 0 (a) (b) Problem 3.76 using an ideal diode model: Problem 1: Problems 3.76 and 3.77 of Jaeger and Blalock. Work only circuits (a,b). ε r 11.7 := V T 0.025 volt := n i 10 10 cm 3 := ε o 8.854 10 14 farad cm 1 := q 1.602 10 19 coul := k B 8.62 10 5 eV K 1 := µ s1 0 6 sec := ms 10 3 sec := eV 1.602 10 19 joule := µ m1 0 6 m := First, define some useful units and constants: Homework # 5 Solutions EE-331 Devices and Circuits 1 Prof. R. B. Darling EE-331 HW#5 Solutions Page 1 R. B. Darling
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Note that the power dissipated by the zener diode is GREATER when the load current is LESS. This might seem backwards, but it is correct. p DZ 3.5watt = p DZ 15 volt () i DZ := Since the diode current IS negative, the diode IS in the breakdown region. i DZ 0.233 amp = i DZ i 150 i RL := i RL 0.0 amp := i 150 0.233 amp = i 150 50 volt 15 volt 150 ohm := (b) R L = infinity: First assume that the zener diode is in the breakdown region: v DZ = -15 V: p DZ 1.25 watt = p DZ 15 volt i DZ := Since the diode current IS negative, the diode IS in the breakdown region. i DZ 0.083 amp = i DZ i 150 i RL := i RL 0.15 amp = i RL 15 volt 100 ohm := i 150 0.233 amp = i 150 50 volt 15 volt 150 ohm := (a) R L = 100 ohms: First assume that the zener diode is in the breakdown region: v DZ = -15 V: Problem 3: Problem 3.86 (a,b) of Jaeger and Blalock.
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This note was uploaded on 09/10/2011 for the course EE 331 taught by Professor Taicheng during the Winter '08 term at University of Washington.

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EE331HW5solutions - EE-331 Devices and Circuits 1 Prof. R....

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