Measuring diode voltage and diode current in this circuit, the student generates the following table of data: Vode (volts) lete (milliamperes) 0.600 1.68 0.625 2.88 0.650 5.00 0.675 8.68 0.700 14.75 0.725 27.25 0.750 48.20 The student knows that the behaviour of a PN junction follows Shockley's diode equation, and that the equation may be simplified to the following form: Idiode = 15 (1) where, K = a constant incorporating both the thermal voltage and the nonideality coefficient. The goal of the experiment is to calculate K and Is, so that the diode's current may be predicted for any arbitrary value of voltage drop. However, the equation must be simplified a bit before the student can proceed. At substantial levels of current, the exponential term is very much larger than unity (eld >> 1), so the equation may be simplified as such: diodels (inde) From this equation, determine how the student would calculate K and I, from the data shown in the table. Also, explain how this student may verify the accuracy of these calculated values.
Measuring diode voltage and diode current in this circuit, the student generates the following table of data: Vode (volts) lete (milliamperes) 0.600 1.68 0.625 2.88 0.650 5.00 0.675 8.68 0.700 14.75 0.725 27.25 0.750 48.20 The student knows that the behaviour of a PN junction follows Shockley's diode equation, and that the equation may be simplified to the following form: Idiode = 15 (1) where, K = a constant incorporating both the thermal voltage and the nonideality coefficient. The goal of the experiment is to calculate K and Is, so that the diode's current may be predicted for any arbitrary value of voltage drop. However, the equation must be simplified a bit before the student can proceed. At substantial levels of current, the exponential term is very much larger than unity (eld >> 1), so the equation may be simplified as such: diodels (inde) From this equation, determine how the student would calculate K and I, from the data shown in the table. Also, explain how this student may verify the accuracy of these calculated values.
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A student sets up a circuit as below to gather data for characterizing a diode:
Transcribed Image Text:100 2
D₁
12 V
0.700
0.725
0.750
Xu
10 km2
Measuring diode voltage and diode current in this circuit, the student generates the following table
of data:
Vdiode (volts) Idiode (milliamperes)
0.600
1.68
0.625
0.650
0.675
2.88
5.00
8.68
14.75
27.25
48.20
The student knows that the behaviour of a PN junction follows Shockley's diode equation, and that
the equation may be simplified to the following form:
Lasode = Is (1)
where,
K = a constant incorporating both the thermal voltage and the nonideality coefficient.
The goal of the experiment is to calculate K and Is, so that the diode's current may be predicted for
any arbitrary value of voltage drop. However, the equation must be simplified a bit before the student
can proceed. At substantial levels of current, the exponential term is very much larger than unity
(elvdiode >> 1), so the equation may be simplified as such:
diode Is
exis (elvdiode/K)
From this equation, determine how the student would calculate K and Is from the data shown in the
table. Also, explain how this student may verify the accuracy of these calculated values.
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