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Rozdział II

Chapter II

Dioda typowe układy i zastosowania
Diode , typical circuits and their use

B.PIwakowski Analog electronics

Chapter II Diode , typical circuits and

their use

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B.PIwakowski Analog electronics Chapter II Diode , typical circuits and their use

A

pA

I

I

U

mV

V

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Obszar przewodzenia
Dioda « odetkana »

forward biased diode

Diode « opened »

Obszar zaporowy
Dioda « zatkana »
diode reversed biased
Current flow is prohibited; “cut off’ “blocked “, “closed” diode.

U

F

=>Napiecie progowe

Forward bias threshold tension

0,6V dla zlacza krzemoweg for silicate jonction

U

F

U

d

d

d

d

I

U

R







Dioda Diode

Opornosc dynamiczna
Dynamic resistivity

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B.PIwakowski Analog electronics Chapter II Diode , typical circuits and their use

d

d

F

F

d

R

I

U

U

U





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Obszar przewodzenia
Dioda « odetkana »
diode reversed biased
f

Obszar zaporowy
Dioda « zatkana »
forward biased diode
Cut-off diode

Dioda ; Schemat zastepczy Diode equivalelnt circuit

U

F

R

d

R

s

=∞

i

d

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U

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U

U

d

i

d

U

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Dioda w obwodzie, statyczny punkt pracy

Diode in circuit , static operating point (bias point)

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R

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U

U

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I

o

U

F

B.PIwakowski Analog electronics

Chapter II Diode , typical circuits and

their use

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Punkt pracy
Bias point, Q point

Rownanie prostej obciazenia
Load line equation

Dioda w obwodzie, układ małosygnalowy Diode in circuit, small signals scheme

U

R

+u

R

(t)

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U

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(t)

t

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m

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Schemat malosygnalowy
(dynamiczny)
Small signal scheme

•

Zrodla napiecia stalego zwarte

•

Zrodla pradu stalego otwarte

•

Constant tension sources are closed

•

Constant current sources are opened

U

F

U

B.PIwakowski Analog electronics Chapter II Diode , typical

circuits and their use

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Typy i zastosowania diody Diode: types and domains of use

Diody sygnalowe signal processing diodes
Prostowanie (diody mocy, =>moc tracona) power diodes , rectifier diodes
Powielacz napięcia, tension multiplier
Detektor szczytowy pic detectors
Ograniczniki limitters, clipping diodes
Przełącznik elektroniczny electronic swiches
Zasilacze impulsowe Pulsed mode power supplies
Napięcie odniesienia U

F

reference voltage

Diody impulsowe (Schottkiego,tunelowa, ostrzowa) pulsed signals diode (Schottky, tunjel, pin)

Parametry Parameters

- Id max
- Ud max
- P

max

Maksymalna moc rozpraszana max dissipated power

- C Pojemność złącza junction capacity
- R

d

-

-U

F

B.PIwakowski Analog electronics Chapter II Diode , typical circuits and their use

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Opornosc dynamiczna
Dynamic resistivity
Napiecie progowe
Forward bias threshold tension

B.PIwakowski Analog electronics

Chapter II Diode , typical circuits and

their use

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t

j

m

e

E

t

e





)

(

U(t)

E

m

i

d

R

Detector szczytowy, Pic detector

Napiecie odniesienia reference voltage U=U

T

T

U

E 

U(t)

U

T

i

d

R

8

Zasilanie Prostownik dwupolowkowy,
Supply circuits Full wave rectifier

B.PIwakowski Analog electronics

Chapter II Diode , typical circuits and

their use

• Stabilizator napięcia tension stabiliser

• Napięcie odniesienia: référence voltage

• :

U

R

I

o

R

E

E

E/R

o

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I

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pracy

punkt

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Zbocze R

z

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

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+

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o

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B.PIwakowski Analog electronics

Chapter II Diode , typical circuits and

their use

9

Dioda Zenera Zener diode

Bias point, Q point

Współczynnik stabilizacji
Stability factor

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B.PIwakowski Analog electronics Chapter II Diode , typical circuits and their use

Pojemność sterowana napięciem
Voltage controlled capacity (Varicap)

Zastosowanie Use:

Modulatory Modulators

Generatory sterowane elektronicznie VCO

VCO Voltage controlled oscillators

Automatyczne dostrajanie
Automatic tuning

=>

Dioda « zatkana » (cut off diode)

Dioda pojemnościowa (vari cap)

R

s

=∞

U

d

i

d

C

j

d

J

U

C 

LC

f

RC

f

1

1





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B.PIwakowski Analog electronics Chapter II Diode , typical circuits and their use

• Pracuje jak zwykla dioda
Operates like typical diode

UF = 2-5V w funkcji koloru

as a fonction of culeur

Id=5-10 mA

Lampy LED LED Lamps !

• Światłoczuła dioda = izolator optyczny
Photo diode = opto isolator

Dioda swiecaca light emitting diode LED

U

d

i

d

U

R

I

o

R

E

+

-