전자 회로 1 lecture 5 (diode ii) 2009. 04. 임한조 아주대학교 전자공학부...

전자 회로 1Lecture 5 (Diode II)

2009. 04.임한조

아주대학교 전자공학부hanjolim@ajou.ac.kr

이 강의 노트는 전자공학부 곽노준 교수께서 08.03 에 작성한 것으로 노트제공에 감사드림 .

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Review

Open circuit: ID = IS

Reverse-bias: I = IS - ID ~= IS

Breakdown (large reverse-bias): almost constant V

Forward-bias: I = ID – IS ~=ID

Current exponentially increases

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Forward-bias

Why n? n=1 or 2. fabrication dependent

Normally i >> Is

Temperature

dependence

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Load line

V / V (3.6)D TnD SI I e

V V (3.7)DD D

DI R

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Various diode modeling

Exponential model calculator solution Iterative analysis (see Example 3.4)

Piecewise linear model

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0V VDD DD

D

IR r

5 0.654.26 mA

1 0.02DI

0V V

0.65 4.26 0.02 0.735 VD D D DI r

Example 3.5 VDD = 5V, R = 1kohm model: VD0 = 0.65V, rD = 20 ohm

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Constant voltage drop model

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The Small-Signal Model

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V-I @ bias: Small perturbation: ( )

Small signal resistance (incremental resistance)

Taylor series approximation

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Zener Diode Mostly used for voltage regulator

knee current

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Example 3.8

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Applications: Rectifier Circuits

Diode circuitSee Chap. 3.5

RC circuitwith large time constant(low pass filter)

Zener diodeSee Chap. 3.4

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The half-wave rectifier

PIV = Vs : Peak inverse voltage PIV < VZ

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The full-wave rectifier

PIV = 2V Vs D

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The bridge rectifier

PIV = V 2V V V Vs D D s D

3 2(revers) = + (forward)D O D

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The peak rectifier (with LPF: RC circuit)

/ (3.23)L Oi R

(3.24)

(3.25)

D C L

IL

i i i

dC idt

Ideal: no load With load

If vI < vO :

Time constant

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Limiter Circuits

Soft limiting

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Clamping Circuits

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Voltage Doubler

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신호 검출기로서의 pn 다이오드

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빛을 전기로 , 전기를 빛으로

- 빛의 흡수 - 자연방출 - 유도방출

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pn 접합 발광 다이오드

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pn 접합 발광 다이오드의 응용

http://www.compoundsemiconductor.net/

Left: La Cittadella, a retail and cinema complex in Kawasaki, Japan, contains a 130 foot high tower illuminated by a variety of intelligent LED lighting effects including rainbow patterns and gradual color shifts. The complex's architect is the Jerde Partnership International, Inc, and the LED illumination is by Color Kinetics. (Photo: Masami Soto.) Center: three bridges across the Clyde river in Glasgow have been illuminated with high-intensity LED lighting. Luxeon LEDs from Lumileds and Philips floodlights were used in the installations. (Photo: Philips). Right: the Gazi Technopolis in Athens, Greece, designed by Duilio Passariello of Philips LiDAC Europe. (Photo: Philips.)

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pn 접합 발광 다이오드의 응용

현대자동차 HCD-8 Concept TourerKawasaki's La Cittadella complex also includes a fountain illuminated by constantly changing colored LED lights. (Photo: Masami Soto.)

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pn 접합 수광 다이오드

-0.5

0.0

0.5

1.0

-5 -4 -3 -2 -1 0 1

빛의 세기 = 0

빛의 세기 = I

빛의 세기 = 2I

I [mA]

V [V]

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pn 접합 태양전지

+ V −