EE122 Homework Set 3 Question 1: Using figures 1 and 2 verify that Is and η are within 40% of 10‐12A and 1.0 respectively at room temperature (@300K, kT/q=.0259V) Figure 1: LTspice schematic for a simple diode with Io=10‐12A, andη(ideality factor)=1.0. Figure 2: Plot of ln(Id) vs. the applied diode voltage, used to extract Io and η(ideality factor). Question 2: Using figure 3 extract Is and η to within 40% at room temperature (@300K, kT/q=.0259V). Figure 3: Plot of ln(Id) vs. applied voltage for a diode with an unknown Io and η. Question 3: A student used figure 4 extract Is and η to within 40% at room temperature (@300K, kT/q=.0259V). The extracted Is and η were 1.5x10‐13A and 0.38. Explain why the extracted values do not “make sense”. What do you think happened? Be specif ic. Figure 4: Plot of ln(Id) vs. applied voltage for a diode with an unknown Io and η. Question 4: A student used figure 5 extract Is and η to within 5% at room temperature (@300K, kT/q=.0259V). The extracted Io and η were .9999A and 643500. Explain why the extracted values do not “make sense”. What do you think happened? Be specif ic. Figure 1: Plot of Id vs. applied voltage for a diode with an unknown Io and η. Question 5: Find the input voltage range for which the following diodes can be used for the ex function. • 1N4148(Motorola) • 1N914 (Motorola) • NSSWS108T (Nichia)
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