# Diodes And Rectifiers

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Diodes and rectifiers
Experiment part 1
Table 1.1
I
D
(A)
D
Value (A)
V
D
(Volts)
30 µA
180
39
100 µA
500
38
200 µA
290
41
400µA
550
45
1 mA
0.9
48
2 mA
0.9
50
6 mA
0.75
55
14 mA
1
56
30 mA
18
57
60 mA
N/A
57
100 mA
N/A
N/A
150mA
N/A
N/A
0
5000
10000
15000
20000
25000
30000
35000
0 10 20 30 40 50 60
I
D
V
D
Linear Plots

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V
Ɣ =
56mV
The value V
Ɣ
depends on the value of current and voltage levels passing through the diode. It is a
function of current at which it is measured. The value also depend on the type of the material
used to make the diode.


=0.380725
Ideality factor (n) =


= (05-3.6)/59.3 = 1.4/59.3
=0.0236
I
S
= 1.4µA
R² = 0.9972
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 1 2 3 4 5 6 7 8 9 10
ID
VD
Semi-log plots

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Diodes and rectifiers Experiment part 1 Table 1.1 ID (A) 30 µA 100 µA 200 µA 400µA 1 mA 2 mA 6 mA 14 mA 30 mA 60 mA 100 mA 150mA Your ID Value (A) 180 500 290 550 0.9 0.9 0.75 1 18 N/A N/A N/A VD (Volts) 39 38 41 45 48 50 55 56 57 57 N/A N/A Linear Plots 35000 30000 25000 ID 20000 15000 10000 5000 0 0 10 20 30 VD 40 50 60 VƔ = 56mV The value VƔ depends on the value of current and voltage levels passing through the diode. It is a function of current at which it is measured. The value also depend on the type of the material used to make the diode. Semi-log plots 5 4.5 R² = 0.9972 4 3.5 ID 3 2.5 2 1.5 1 0.5 0 0 1 2 3 4 5 VD ∆𝐼𝐷 Gradient = ∆𝑉𝐷 =0.380725 ∆𝑉𝐷 Ideality factor (n) = 59.3𝑚𝑉 = (05-3.6)/59.3 = 1.4/59.3 =0.0236 IS = 1.4µA 6 7 8 9 10 Experiment part 2 Capacitor(µF) 470 2200 4700 Ripple Voltage (V) 40 10 6 Questions 1. Time constant =RC Capacitor (µF) Time constant(s) 470 0.47 2200 2.20 4700 4.70 2. 𝑉𝑟𝑖𝑝𝑝𝑙𝑒 = 𝐼𝑙𝑜𝑎𝑑 𝐹𝐶 Where: V ripple = the maximum ripple voltage on the DC output I Load= the DC load current F = the frequency of the ripple (2X 60.0HZ) C = the ...
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