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CUPRINS
P r e f a ţ ă
3
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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