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SOLID STATE DIODE

Diode Circuits

by Tran Quang Vinh - 2010

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Pn Junction and structure of diode

by Tran Quang Vinh - 2010

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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

by Tran Quang Vinh - 2010

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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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pp

Applications of diodes

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Applications of diodes

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