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CUPRINS

P r e f a ţ ă

Cap.

1 N o ţ i u n i introductive 11 

1.1. Introducere

1.2.

Dispozitive electronice

clasificarea lor

12

1.3.

Circuite

electronice Semnale

13 

1.3.2.

Semnale

electrice

14 

Cap. 2. Dispozitive

semiconductoare

.

17

2.1.

Conductibilitatea

e l e c t r i c ă

n

semiconductoare

17

2.2.

J o n c ţ i u n e a

pn 20 

2.2.1.

Procese

fizice

la

interfata pn Caracteristica s t t i c ă a

jonc-

ţ i u n i i

pn 20 

2.2.2.

Modele liniarizate

pentru

j o n c ţ i u n e a

pn

în

regim de curent

continuu

static)

23 

2.2.3.

J o n c ţ i u n e a

pn în .regim variabil

la

semnale mici 24 

2.3. Tipuri

e

diode

semiconductoare

26 

2.3.1. Diode redresoare

cu

j o n c ţ i u n e 26 

2.3.2. Diode

cu contact

punctiform

28

2.3.3. Diqde redresoare

cu cuproxjd seleniu

28

2.3.4. Diode

Zener

stabilizatoare de

tensiune)

29 

2.3.5. Diode

tunel

31 

2.3.6. Diode

cu capacitate v a r i a b i l ă 31

2.4. Tranzistoare bipolare cu j o n c ţ i u n i 32 

2.4.1.

u n c ţ i o n a r e a tranzistorului bipolar

32 

2.4.2.

Procedee tehnologice

pentru

fabricarea tranzistoarelor

cu

j o n c ţ i u n i

35 

2.4.3.

Caracteristicile statice ale tranzistorului bipolar

37 

2.4.4. Circuite echivalente modele) statice liniarizate pentru tran-

zistoare bipolare 41 

2.4.5.

I n f l u e n ţ a temperaturii asupra

regimului static al tranzisto-

rului

2.4.6. Regimul termic

al tranzistorului

42 

43

5

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2.4.7. o n s i d e r a ţ i i

privind alegerea punctului static

de

f u n c ţ i o n a r e

determinarea sa g r a f i c ă

.

44 

2.4.8.

Circuite de polarizare

care

a s i g u r ă stabilizarea t e r m i c ă

a

punctului static de f u n c ţ i o n a r e 48 

2.4.9.

Parametrii

de

semnal

mic ai

tranzistorului

bipo1ar sche

mele

echivalente 50 

2.4.10.

Studiul

regimului

dinamic al tranzistorului bipolar la semnale

mici

f r e c v e n ţ e

joase .

57 

2.4.11.

Tranzistorul bipolar

in

regim

de

c o m u t a ţ i e

59

2.5. Tranzistoare

cu

efect de cîmp unipolare) 62 

2.5.1. Structura principiul de f u n c ţ i o n a r e

al tranzistoarelor cu

efect

de cîmp

cu

g r i l ă i z o l t ă

TEC-MIS) 62 

2.5.2.

Caracteristicile statice ale

TEC-MIS 63 

2.5.3. Structura principiul de · f u n c ţ i o n r e

al

tranzistoarelor cu

efect de cimp

cu

g r i l ă j o n c ţ i u n e 66 

2.5.4.

Caracteristicile statice

ale TEC J 67 

2.5.5.

Circuite

de polarizare pentru TEC 68

2.5.6..

Parametrii

de

semnal

mic

circuitul echivalent al

tranzisto

rului cu ~ f e c t de cîmp

. .

71

2.5.7. F u n c ţ i o n a r e a

TEC

ca amplificator de j o a s ă f r e c v e n ţ ă 77 

2.5.8. TEC

in

regim de c o m u t a ţ i e . 73 

2.6. Dispozitive semiconductoare multijonctiune DMJ)

2.6.1. G e n e r a l i t ă ţ i

2.6.2. Structura

pnpn

2.6.3. Tiristorul

2.6.4.

Triactil .

2.7.

Dispozitive

semiconductoare

optoelectronice

2.7.1.

F o t o r e z i s t e n ţ a

.

2.7.2.

Fotodi9da

.

75 

75 

77 

82 

83 

85 

86 

86 

2.7.3.

Fototranzistorul 88 

2.7.4. Celula f o t o v o l t a j c ă 88 

2.7.5. Dioda

f o t o e m i s i v ă

89 

2.8.

Alte

dispozitive semiconductoare

91 

2.8.1.

Tranzistorul

u n i j o n c ţ i u n e TUJ)

91 

2.8.2.

Termistorul

varistorul 92 

Cap

3

Amplificatoare 94 

3.1. Caracteristici generale ale

amplificatoarelor

94 

3.1.1. Definirea amplificatoarelor 94 

3.1.2. Clasificarea amplificatoarelor 95 

3.1.3. Amplificatoare inyersoare neinversoare 97 

3.1.4. Parametrii amplificatoarelor 98 

3.2.

Amplificatoare

de semnal mic

cu cuplaj

R

103

3.2.1. Etajul de amplificare

. ·

103 

3.2.2. Etajul de amplificare de semnal

rp.ic

cu tranzistor bipolar cu

efect de cimp.

.

104 

3.3. Amplificatoare de

putere

112 

3.3.1. Etaje finale

. .

113 

3.3.2. Etaje de c o m a n d ă a

tranzistoarelor

finale 121

6

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3 4 Amplificatoare de

curent continuu

122

3 4 1

Cuplarea

d i r e c t ă a

o u ă

etaje de amplificare 123 

3 4 2 Amplificatorul diferentia 125 

3 5

Amplificatoare cu

reactie 128 

3 5 1

P r i n c i p ~ u l r e a c ţ i e i

128 

3 5 2 Efectele

r e a c ţ i e i

asupra n e l i n i a r i t ă ţ i l o r amplificatorului 129

3 5 3

Efectul

r e a c ţ i e i asupra distorsiunilor 130 

3 5 4 Tipuri

de

r e a c ţ i e

i n f l u e n ţ a

r e a c ţ i e i

asupra parametrilor de

intrare i e ş i r e

3 5 5

Amplificatoare o p e r a ţ i o n a l e

Cap

4

Oscilatoare electronice •

4 1 Consideratii generale

4 1 1 Caracteristici generale

4 1 2 Domenii

de utilizare

4 2

Sisteme

oscilante

4 2 1

Caracterizarea sistemelor

oscilante

liniare de ordinul

2

4 2 2 Functii de r e ţ e a

4 2 3 Clasificarea

oscilatoarelor electronice

4 3 Oscilatoare

cu r e z i s t e n ţ ă

d i n a m i c ă n e g a t i v ă

4 4 Oscilatoare cu reactie

4 4 1 o n d i ţ i i l e de amorsare a o s c i l a ţ i i l o r

4 4 2

Limitarea

amplitudinii de o s c i l a ţ i e

4 4 3 Oscilatoare LC cu r e a c ţ i e

4 4 4

Oscilatoare R cu r e a c ţ i e

Cap 5 Circuite de

impulsuri

5 1

o n s i d e r a ţ i i generale

5 1 1

Caracterizarea impulsurilor

5 1 2 Clasificarea circuitelor de formare

5 2

Circuite de

formare liniare

5 2 1 Circuite

de derivare

5 2 2

Circuite de integrare

5 3

Circuite

de

formare

neliniare

f ă r ă

memorie

5 3 1 Circuite de formare

cu

diode

5 3 2 Amplificator

imitator

5 3 3

Amplificator d i f e r e n ţ i a l Comparator

5 4

Circuite de

formare

neliniare cu

memorie

5 4 1

Comparatoare cu histerezis

5 4 2

Circuite

de

formare cu

dipoli VNR CNR

5 4 3 Circuite

basculante

Cap 6

Circuite

logice

6 1

Consideratii generale

6 1 1

P r o p r i e t ă ţ i logice

6 1 2 Clasificarea circuitelor logice

6 2 Circuite

logice combinationale

Principii

de pro ~ c l a r e

131

133 

139 

139 

139 

140 

141

141 

142 

143 

143 

145 

145

147 

150 

152 

155 

155 

155 

156 

156 

157 

158 

159 

159 

160 

161

163 

163 

166 

166

177 

177 

177 

179

180 

7

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6.2.1. F u n c ţ i i

booleene

.

6.2.2. Minimizarea

f u n c ţ i i l o r booleene

<f. .6.2.3. Diagrama Karnaugh

6.2.4. Exemple de circuite c o m b i n a ţ i o n a l e

6.3. Circuite de memorie circuite basculante

bistabile

6.3.1. Bistabilul asincron RS

6.3.2.

Bistabilul sincron

RST

6.3.3. Bistabilul

RS s t ă p î n s c l a v

6.3.4.

Bistabilul JK

.

6.3.5. Bistabilul

D

cu z ă v o r i r e

6.3.6.

Bistabilul

D a c ţ i o n a t pe front

6.4. Circuite logice secventiale

6.4.1.

u m ă r ă t o a r e

6.4.2. Registre

.

6.5.

Familii

de circuite logice

6.5.1. Circuite logice TTL

6.5.2. Circuite logice

HLL

6.6.

Circuite

de

i n t e r f a ţ ă

.

6.6.1. Convertoare numeric analogice {N/A)

6.6.2. Convertoare

analog numeri ce A/N)

181 

182 

182 

183 

184 

185 

186 

186 

187 

188 

188 

189 

189 

192 

193 

193

195 

196 

197 

198

Cap.

7. Circuite de redresare

201

201

201

202 

202 

202 

206 

210 

213 

8

7.1. G e n e r a l i t ă ţ i

7.1.1.

Schema

bloc

a

unui redresor

7.1.2. Tipuri de redresoare

7.2.

Redresoare

monofazate

necomandate)

7.2.1.

Redresorul

m o n o a l t e r n a n ţ ă

cu

s a r c i n ă r e z i s t i v ă

7.2.2. Redresorul d u b l ă a l t e r n a n ţ ă

cu

s a r c i n ă r e z i s t i v ă

7.2.3. Redresorul monofazat

cu

s a r c i n ă RL

7.2.4. Redresorul monofazat cu s a r c i n ă R

7.3. Redresoare polifazate

7.3.1. Redresorul polifazat

cu

punct neutru

7.3.2. Redresorul polifazat

in

punte

7.3.3. Redresorul polifazat cu b o b i n ă de

egalizare

216 

216 

223 

225 

7.4.

P r o t e c ţ i a redresoarelor

de

mare putere

226 

7.5.

Filtrarea

tensiunii redresate 227 

7.5.1. Filtre cu i n d u c t a n ţ ă 229 

7.5.2. Filtre

cu

capacitate 231

7.5.3. Filtre complexe 231

7.5.4. Filtre cu tranzistoare 233 

7.6.

Consideratii

suplimentare

asupra

p r o i e c t ă r i i redresoarelor 233 

7.7. Redresoare

comandate

• 235 

7.7.1.

Redresoare comandate

monofazate

236 

7.7.2.

Redresoare comandate

polifazate 238 

7.7.3.

Redresoare comandate cu reglajul tensiunii în primarul trans

formatorului de r e ţ e 242 

7.7.4. Circuite de c o m a n d ă a redresoarelor reglabile . 245 

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Cap

8

Invertoare convertoare 248 

8 1

Consideratii

generale 248 

8 2

lnvertoare

249 

8 2 1 D e f i n i ţ i i Principiul de f u n c ţ i o n r e 249 

8 2 2

Tipuri de invertoare

252 

8 2 3 Invertoare cu tranzistoare 254 

8 2 4 Invertoare autonome

cu

tiristoare 255 

8 2 5 Invertoare

neautonome cu tiristoare

264 

8 2 6 Reglarea tensiuni de i e ş i r e a invertoarelor 267 

8 3 Convertoare de tensiune

c o n t i n u ă 27

8 4 Convertoare de

f r e c v e n t ă

275 

Cap

9

Alte circuite utilizate

n

electronica

i n d u s t r i a l ă 279 

9 1 Stabilizatoare electronice de tensiune 279 

9 1 1

Stabilizatoare

parametrice

cu d i o d ă Zener

280 

9 1 2

Stabilizatoare

de

tensiune cu element de control

283 

9 1 3

Stabilizatoare

de tensiune

cu element

de control

serie

283 

9 2 Relee electronice Circuite de semnalizare protectie 285 

9 2 1 Relee de

tensiune comparatoare

de nivel 285 

9 2 2

Relee electronice

de

timp

289 

9 2 3 Relee fotoelectronice 295 

9 2 4 ircuite de

semnalizare

p r o t e c ţ i e în r e ţ e l e l e

electrice

299 

9 3 Contactoare statice 304 

9 3 1

ontactoare statice

de curent alternativ 304 

9 3 2

ontactoare statice

de curent

continuu

312 

Bibliografie 315 

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