diode english final
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SOLID STATE DIODE
Diode Circuits
by Tran Quang Vinh - 2010
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Pn Junction and structure of diode
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4by Tran Quang Vinh - 2010
Pn Junction and structure of diode
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5by Tran Quang Vinh - 2010
Pn Junction and structure of diode
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The I-V Characteristics and Mathematical Model
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Diode under reverse, zero and forward bias
Reverse: [ ]SS
T
D
SDII
V
vIi =
= 1)4exp(1exp
Zero: 00 ==DDiv
Forward:
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Table of Technical Specifications
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Equivalent scheme of diode in circuits
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Diode Circuit Analysis
DDCvRiV +=
Using the Load-line and the I-V characteristic
Circuit
Q: quiescent point
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VC
= 10 V
R = 10 k
IS = 10-13 A
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Diode Circuit Analysis
Using the Mathematics Model
R
Vv
Ri
V
vIi
c
DD
T
D
SD
+=
=
1
1exp
Use MATLAB to resolve the system of two equations
function xd = diode (vd)
xd = @(x)(10 (10^(-9))*(exp(40*vd) 1) vd);
fzero(diode,1)
Answer: 0.5742 V
VC
= 10 V
R = 10 k
IS = 10-13 A
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Diode Circuit Analysis
Using the Ideal Diode Model
Using the Constant Voltage Drop Model (CVD model)
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Diode Circuit Analysis
vD
iD
0 Von
Slop
=
1/R
S
OFF ON
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Diode Circuit Analysis
Comparision between models
0.600 V0.940 mACVD model
0 V1.00 mAIdeal diode model
0.547 V0.942 mAMathematical model
0.6 V0.94 mALoad-line analysis
Diode VoltageDiode CurrentAnalysis Technique
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Multiple - Diode Circuits
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Multiple - Diode Circuits
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21by Tran Quang Vinh - 2010
Analysis diode in the Breakdown Region
-20 = VD + 5.000 ID
VD = 0, ID = - 4 mA
VD = - 5V, ID = -3 mA
Q-point = (- 2.9 mA , -5.2 V )
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Small signal Model
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
a nonzero current is present in the diode for only a very small fraction of the period
T, yet an almost constant dc current is flowing out of the filter capacitor to the load.
The repetitive current pulse can be modeled approximately by a triangle of heightIP
and width T.
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Mch chnh lu bi p ?
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Applications of diodes
A li i f di d
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
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Applications of diodes
Dynamic switching behavior of diodes
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y g
Applications of diodes
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pp
Applications of diodes
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Applications of diodes
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