1)  plot the diode’s I-V characteristics on a linear scale (ID on the y-axis and VD on the x-axis)  2)  [RP4] 3)  [RP5]

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The circle is below(for D1-1N4148 is 1N4148 Diode).  and also there have a table(. Note that the first 3 rows of measurement are obtained when the diode is reverse-biased)

Vout_dc (V)

VD (V)

ID (μA)

0.51

-0.51

0.0

0.23

-0.20

0.0

0.10

-0.08

0.0

0.00

0.00

0.0

0.05

0.04

0.0

0.11

0.09

0.0

0.17

0.15

0.1

0.19

0.20

0.1

0.27 

0.25

0.4

0.32

0.30

1.6

0.36

0.34

3.1

0.42

0.40

8.2

0.46

0.42

14.3

0.52

0.47

28.0

Questions:

1)  plot the diode’s I-V characteristics on a linear scale (ID on the y-axis and VD on the x-axis) 

2)  [RP4]

3)  [RP5]

 

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1.4 Obviously, the linear scale on the y-axis makes it hard to understand or model the diode.
You might consider a logarithmic plot to do this. You will replot your data on the y-axis in the log
scale (the grid example is in figure 7 if you plot by hand). If you use MATLAB, run the code and
see plot figure 2 (in MATLAB), blue line.
10
100
10-1
102
103
104
105
10
-0.5
-0.4
-0.3 -0.2
-0.1
0.1
0.2
0.3
0.4
0.5
Figure 7. An empty semilog (log-linear) plot.
1.5 Next, you will fit the theoretical diode model in equation1 below to the measured data.
Use a red color to indicate the diode theoretical equation and blue for the measured data. The
diode follows the relationship in equation 1. Pick Is and VT such that the theoretical diode current
io from equation 1 provides a good approximation of your measured current Ib. Adjusting Is will
shift the curve up and down. Adjusting Vr will change the slope of the curve. You can repeatedly
adjust the value of Is and Vr in MATLAB (line 55 and 56) and replot them until you think both
curves are close.
What is the value of your Is and Vr that makes the ideal diode model fit the experimental l-V
curve [RP4]?
Include in your report a semilog plot that shows the theoretical diode characteristics fitting
the experimental -V curve (with your choice for Is and Vt in RP4) [RP5].
VD
ip = Is(eVr – 1)
Equation 1. Shockley ideal diode equation.
where
İp is the diode current,
Iş is the reverse-bias saturation current (constant),
Vo is the voltage across the diode, and
Vr is the thermal voltage (constant under a certain temperature)
Transcribed Image Text:1.4 Obviously, the linear scale on the y-axis makes it hard to understand or model the diode. You might consider a logarithmic plot to do this. You will replot your data on the y-axis in the log scale (the grid example is in figure 7 if you plot by hand). If you use MATLAB, run the code and see plot figure 2 (in MATLAB), blue line. 10 100 10-1 102 103 104 105 10 -0.5 -0.4 -0.3 -0.2 -0.1 0.1 0.2 0.3 0.4 0.5 Figure 7. An empty semilog (log-linear) plot. 1.5 Next, you will fit the theoretical diode model in equation1 below to the measured data. Use a red color to indicate the diode theoretical equation and blue for the measured data. The diode follows the relationship in equation 1. Pick Is and VT such that the theoretical diode current io from equation 1 provides a good approximation of your measured current Ib. Adjusting Is will shift the curve up and down. Adjusting Vr will change the slope of the curve. You can repeatedly adjust the value of Is and Vr in MATLAB (line 55 and 56) and replot them until you think both curves are close. What is the value of your Is and Vr that makes the ideal diode model fit the experimental l-V curve [RP4]? Include in your report a semilog plot that shows the theoretical diode characteristics fitting the experimental -V curve (with your choice for Is and Vt in RP4) [RP5]. VD ip = Is(eVr – 1) Equation 1. Shockley ideal diode equation. where İp is the diode current, Iş is the reverse-bias saturation current (constant), Vo is the voltage across the diode, and Vr is the thermal voltage (constant under a certain temperature)
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