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8/15/2019 Electronica 12 [Compatibility Mode]
http://slidepdf.com/reader/full/electronica-12-compatibility-mode 1/17
Dispozitive electronice
Tema 12
Amplificatorul operaţional
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Amplificatorul diferenţial
Tranzistorii T1 si T2 – trebuie sa fie
foarte bine imperechiati astfel incat sa
aiba parametrii identici.
U1 si U2 – tensiunile de intrare aplicate
intre cele doua baze si masa
V1 si V2 – potentialele fata de masa ale
selor doi colectori
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Amplificarea diferenţială
Amplificarea de mod comun
(ideal → 0)
Factorul de rejecţie a modului comun (Common-Mode
Rejection Ratio)
(ideal → ∞)
2
2
C
d ies d d
e
R A u A u
r
2
C
mc
E e
R A
R r
d E
mc e
A R
CMRR A r
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Amplificatorul operaţional
Este un amplificator electronic cu mai multe etaje, dintre care
primul este totdeauna un amplificator diferenţial, care
lucrează şi în curent continuu, cu amplificare cât mai mare,
care să poată fi “sacrificată” prin reacţie negativă pentru
îmbunătăţirea performanţelor.
Cuplarea dintre etaje este directă, ca urmare caracteristicile de
frecvenţă sunt bune, în măsura în care nu utilizăm circuitul lafrecvente atât de mari încât capacităţile parazite şi cele
asociate joncţiunilor să nu mai poată fi neglijate.
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Semnale
diferentiale de
intrare
Semnale de mod
comun de
intrare.
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AO ideal
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Amplificatorul neinversor
Amplificatorul inversor
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AO real
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Sumatorul
1 2
1 2
1 2
...
...
ies k
k
ies k
R R Ru u u u R R R
u u u u
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Integratorul
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Circuitul de derivare