Amplificadores a Transistor TBJ

8/17/2019 Amplificadores a Transistor TBJ

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AMPLIFICADORESLINEARES

A TBJ


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Generalidades

+-

VCC

RC

RS

vs(!

+vBE-

+vCE-

C

E

B

VSS

iB

iC

vCE

iC

IB"

P#n# $%ies&ene

(de '#laria)*#! 'ara vs(!,

Rea de &ar.a


3/116

+-

VCC

RC

RS

vs(!

+vBE-

+vCE-

C

E

B

VSS

iB

iC

vCE

iC

IB"

iB/01

iB/in

VCE"


4/116

vCE

iC

IB"

iB/01

iB/in

VCE"

iC/01

iC/in

IC"

vCE/01vCE/in


5/116

+-

VCC

RC

RS

vs(

!

+vBE

-

+

vCE-

C

E

B

VSS

vSS , VSS + vss(!

vBE , VBE + v2e(!

vCE , VCE + v&e(!

iB , IB + i2(!

iC , IC + i&(!

C#nven)*#

1A , 3A + 1a

sinal

/'le#

/'#nene DC

/'#nene AC


6/116

iB , IB + i2(!

iC , β4iB

iC , IC + i&(! , βIB + βi2(!

β da #rde/ de &enenas

∆iB , iB/01 5 iB/in #rde/ de 6-7 A

∆iC , iC/01 5 iC/in #rde/ de 6-

8 A

IB"

iB

IC"

iC


7/116

Aen)*#

iC , IC + i&(! , βIB + βi2(!

C#/# β n*# 9 nsane (dis'#siiv# n*# linear!

IC : βIB e i&(! : βi2(!

A ;#r/a de #nda n*# 9 re'r#d%ida


8/116

De /#d# an0l#.# 'ara val#res

='is de resis>n&ias RS e

RC

∆vBE , vBE/01 5 vBE/in #rde/ de6-? V

∆vCE , vCE/01 5 vCE/in #rde/ de6 V

VBE"

vBE

VCE"

vCE

VCE : VCE" e VBE : VBE"


9/116

P#ran# # ransis#r 2i'#lar 9 &a'a de

a/'li


10/116

P#ran# # ransis#r 2i'#lar 9 &a'a de

a/'li


11/116

Na re.i*# de SATRAO as &ara&er=si&as se

a'r#1i/a/ e

n*# 0 a/'li


12/116

I/'#rn&ia d# PONTO DE POLARIAO

("IESCENTE!

das ;#nes DC $%e ali/ena/ # &ir&%i# $%e 9

reirada a '#>n&ia e1ra d# sinal

a/'li


13/116

L#&alia)*# d# '#n# $%ies&ene

3M01i/a e1&%rs*# si/9ri&a d# sinal a/'li


14/116




15/116




16/116




17/116




18/116

Dis#r)*# da ;#r/a de #nda

∆iBH? , iB/01 - IB" , IB" -iB/in

vCE

iC

IB"

iB/01

iB/in

VCE"

iC/01

iC/in

IC"

vCE/01vCE/in

/as

es'a)a/en#s desi.%ais

e in&lina)es vari0veis


19/116

Mas444 #'erand# / PE"ENOSSINAIS

vCE

iC

IB"

iB/01

iB/in

VCE"

iC/01

iC/in

IC"

vCE/01vCE/in

∆iB /%i#'e$%ena

Cara&er=si&as

reil=neas 'aralelas e

%ni;#r/e/ene

es a adas


20/116

O'era)*# /

PE"ENOS SINAIS , COMPONENTES AC DE PE"ENAAMPLITDE

A e1&%rs*# d# sinal li/ia-se a %/a viinan)a d#

'#n# $%ies&ene

Nesa viinan)a as &ara&er=si&as I-V '#de/ ser

nsideradas reil=neas 'aralelas e %ni;#r/e/ene

es'a)adas

O TBJ '#de ser a'r#1i/ad# '#r %/ DISPOSITIVO

LINEAR


21/116

M#del#s d# TBJ 'ara #'era)*#/ 'e$%en#s sinais

e/ 2ai1as ;re$%>n&ias

I!M#del# de Par/er#s K=2rid#s na C#n


22/116

&ara&er=si&as de enrada na n


23/116

a'r#1i/a)*#

CE"CE

BEB

"B

BEBE vv

vii

vv

∆∂

∂

∂

∂

≅

∆

vBE , vBE 5 VBE" vBE 5 VBE , v2e

∆

iB , iB 5 IB" iB 5 IB , i2

∆

vCE , vCE 5 VCE" vCE 5 VCE , v&e

&e"CE

BE2

"B

BE2e vv

vi

iv

v∂

∂

∂

∂

≅


24/116

&e

"CE

BE2

"B

BE2e vv

vi

iv

v

∂

∂

∂

∂

≅

De


25/116

&e

"CE

BE2

"B

BE2e vv

vi

iv

v

∂

∂

∂

∂

≅

De


26/116

&e

"CE

BE2

"B

BE2e vv

vi

iv

v

∂

∂

∂

∂

≅

&ere2ie2e viv

A /'#nene AC de v2e 9 %/a

COMBINAO LINEARdas /'#nenes AC de i2 e v&e


27/116

Re'resena)*# arav9s de rede

linear

+

v2e

-

i2

B

E

+-

ie

rev&e

&ere2ie2e viv


28/116

&ara&er=si&as de sa=da na n


29/116

a'r#1i/a)*#

∆

iC , iC 5 IC" iC 5 IC , i&

∆

iB , iB 5 IB" iB 5 IB , i2

∆

vCE , vCE 5 VCE" vCE 5 VCE , v&e

&e"CE

C2

"B

C& vv

ii

ii

i∂

∂

∂

∂

≅

CE"CE

CB

"B

CC vv

i

ii

i

i ∆∂

∂

∂

∂

≅


30/116

De


31/116

De


32/116

&e#e2;e& vii

A /'#nene AC de i& 9 %/a

COMBINAO LINEARdas /'#nenes AC de i2 e v&e

&e

"CE

C2

"B

C& vv

ii

ii

i

∂

∂

∂

∂

≅


33/116

Re'resena)*# arav9s de rede

linear

&e#e2;e& vii

+

v&e

-

C

E

i&

;ei2 6H#e


34/116

"ADRIPOLO LINEAR $%e

re'resena # TBJ na #'era)*# /

'e$%en#s sinais(s 'ara as /'#nenes AC!

&e#e2;e& vii &ere2ie2e viv

+

v&e

-

C

E

i&

;ei2 6H#e

+

v2e

-

i2

B

E

+-

ie

rev&e


35/116

Iner'rea)*# .r0


36/116

Iner'rea)*# .r0


37/116

Iner'rea)*# .r0


38/116

Iner'rea)*# .r0


39/116

Iner'rea)*# .r0


40/116

Iner'rea)*# .r0


41/116

II! M#del# de Par/er#s π-=2rid#s

22e irv π#

&e2e/& r

vv.i

+

v&e

-

C

E

i&

./v2e r#

+

v2e

-

i2

B

E

rπ


42/116

Na re.i*# aiva

CvSC IeIi BE ηφ

C"V

S

"BE

C

/

Ie

I

v

i. BE"

ηφηφ∂

∂

=

ηφ

CvSB IeIi BE −β

ηφ

/C"

6

"BE

B

.Iv

ir

β

=

φ

β

∂

∂

=

−

π

r# invers# da in&lina)*# da &ara&er=si&a desa=da e/ #rn# d# '#n# $%ies&ene

/#dela/#dela# e;ei# EarlQ# e;ei# EarlQ


43/116

Os /#del#s lineares d# TBJ 'ara#'era)*# / 'e$%en#s sinais

S se a'li&a/ s /'#nenes AC d#ssinais de 'e$%enas a/'li%des

De'ende/ das in&lina)es ees'a)a/en#s relaiv#s das&ara&er=si&as '#ran#444

De'ende/ d# '#n# $%ies&ene d#dis'#siiv# (e&n#l#.ia! e dae/'era%ra

P#de/ er se%s 'ar/er#s

nverid#s %ns n#s #%r#s


44/116

Cara&er=si&as de Dese/'en#de A/'li


45/116

(ii! Gan#s de rrene

i

#i

i

iA =

+-

RS

RLvs

+

vi

-

+

v#

-

ii i#

RPOL

is

s

#is i

iA

=


46/116

(iii! Resis>n&ia de enrada ,resis>n&ia de T9venin visa da

enrada

i

ii i

vR =

+-

RS

RLvs

+

vi

-

+

v#

-

ii i#

RPOL

is

iPOLs

ii RHHRi

vR =


47/116

+-

RS

vs

+

vi

-

Ri

is

vsi

ivs

ssi

ii

ARR

RA

vRR

Rv

′

=

′

=


48/116

iPOLi

POLis

sPOLi

POLi

ARR

RA

iRR

Ri

+-

RS

vs

+

vi

-

Ri

is

RPOL

ii


49/116

(iv! Resis>n&ia de sa=da ,resis>n&ia de T9venin visa da sa=da

+-

RS

vs , +vi

-

+

v#

-

ii -i#

RPOL

is

v#

##

si

vR

=


50/116

As &ara&er=si&as de dese/'en#

S*# 'ar/er#s din/is - rela&i#na/ as/'#nenes AC d#s sinais

P#de/ ser e1'ressas e/ er/#s d#s 'ar/er#s de/#dela.e/ d# TBJ e as resis>n&ias d# &ir&%i#

De'ende/ d# '#n# de '#laria)*#


51/116

Ca'a&in&ias de A'la/en#

S*# %iliadas e/ &ir&%i#s dis&re#s 'ara eviar$%e as resis>n&ias de ;#ne e de &ar.a e deenrada e sa=da de 2l#s viin#s inern&ias 2l#$%eand# a 'assa.e/ darrene DC

Para n*# alerar # &ir&%i# AC deve/a'resenar i/'edn&ia des're=vel nas;re$%>n&ias de #'era)*# d# a/'li


52/116

+-

RS

R

L

Ri6

VCC VCC VCC

C6 C? C8 C

R#6 Ri? Ri8R#? R#8

∞

ω

= -iC6


53/116

+-

RS

R

L

Ri6

VCC VCC VCC

C6 C? C8 C

R#6 Ri? Ri8R#? R#8

6is6/in RR/inC

6

′


54/116

Me#d#l#.ia de An0lise de A/'li


55/116

Es0.i#s B0sis de A/'li


56/116

A! C#n


57/116

+

-

VCC

RC

RE

RB6

RB?

CL

CE

CSRS

RLvs

+

vI-

+

vO

-

CE , &a'a&i#r deaerra/en# d#

er/inal de e/iss#r'ara sinais AC

C i d


58/116

+

-

VCC

RC

RE

RB6

RB?

CL

CE

CSRS

RLvs

+

vI-

+

vO

-

CE , &a'a&i#r deaerra/en# d#

er/inal de e/iss#r'ara sinais AC

Deve ;%n&i#nar /#&%r# nas ;re$%>n&ias de#'era)*#

EE/in

RC

6


59/116

Pass# ? Cir&%i# e$%ivalene AC

+-

RCRB6RB?

RS

RLvs

+vi-

+

v#

-



60/116


+-

RCRB , RB6

HHRB?

RS

RLvs

+vi-

+

v#

-

is ii

i#

BC

E

Pass# 8 S%2si%i)*# d# TBJ '#r


61/116

Pass# 8 S%2si%i)*# d# TBJ '#r/#del#

+-

RC

RB

RS

RLvs+vi-

+

v#

-

isii , i2 i#

B C

E

+-

ie

i&

;ei2

rev&e 6H#e

Pass# 8


62/116

Pass# 8M#del# si/'li


63/116



64/116



65/116



66/116



67/116



68/116

Pass# An0lise d# &ir&%i#

+

v#

-

2;e&2i

&LC#&LC

C#2iei

iDiii

iRHHRviRR

RiiDv

=

+-

RCRB

RS

RLvs+v

i-

isii , i2 i#

B C

E

ie

i&

;ei2

Ri Ri R# R#



69/116


sSi

ii v

RR

Rv

′

=

+- Ri

RS

vs+v

i-

is

B



70/116


s

iB

B2i i

RR

Rii

=

+- RB

RS

vs+v

i-

isii , i2

B

Ri

Ri Ri


71/116

2i

2iei

ii

iDv

=

=

iei

ii D

i

vR =

O4G4 68 Ω (/9dia!

siB

B

2i i

RR

Rii

=

iBs

i

i RHHR

i

vR =

O4G4 68 Ω

(/9dia!


72/116

2;e&

&LC#

2iei

iDi

iRHHRv

iDv

=

=

ie

;eLC

i

#v

D

DRHHR

v

vA

O4G4 6? (al#!/ invers*# de

;ase

vSi

i

s

#

vs A

RR

R

v

vA

′

=


;ase

sSi

i

i vRR

Rv

′

=


73/116

;eLC

C

i

#i D

RR

R

i

iA


;ase

iBi

B

s

#

is A

RR

R

i

iA

=


;ase

2;e&

&LC

C

#

2i

iDi

iRR

Ri

ii

=

=

siB

B

2i iRR

R

ii =

Deer/ina)*# das resis>n&ias de


74/116

Deer/ina)*# das resis>n&ias desa=da

∞

=

=

-v&

##

2;e&2s

si

vR

-iDi-i-v

RB

RS

vs,

+

vi-

isii , i2 i&

B C

E

ie;ei2

R#

+

-v#


75/116

R# R#

+

v#

-

+

-

RC

-i#C

E

i&

;ei2

#

-v#

##

RRR

RHHRi

vR

s

≅

=

=

= O4G4 68 Ω

(/9dia!


76/116

B! C#nn&ia 'ara #ssinais AC

(/%/ enre a enrada e a sa=da!

B! C#n


77/116

! . )

+

-

VCC

RC

RE

RB6

RB?

CL

CB

CS RSRL

vs

+

vI-

+

vO

-

C

E

B

B! C#n


78/116

! . )

+

-

VCC

RC

RE

RB6

RB?

CL

CB

CS RSRL

vs

+

vI-

+

vO

-

C

E

B

B 'aerra/en# d#

er/inal de 2ase 'arasinais AC

B! C#n


79/116

! . )

+

-

VCC

RC

RE

RB6

RB?

CL

CB

CS RSRL

vs

+

vI-

+

vO

-

C

E

B

B 'aerra/en# d#


Deve ;%n&i#nar /#

&%r# nas ;re$%>n&ias de#'era)*#

?B6BB/in

RHHRC

6


80/116

$

+- RCRE

RS

RLvs +vi-

+

v#

-

is ii i#

CE

B

Pass# 8 S%2si%i)*# d# TBJ '#r


81/116

) J '/#del#

+-

+

v#

-

RCRE

RS

RLvs+vi-

is i2

i#

B

C

E

-+

ie

i&

;ei2

rev&e

6H#eii , -ie

Pass# 8 M#del# si/'li


82/116

'v0lid#

+-

+

v#

-

RCRE

RS

RLvs+vi-

is i2

i#

B

C

E

-+

ie

i&

;ei2

rev&e

6H#eii , -ie

i#re2iei vvDiDv

v&e



83/116

+-

+

v#

-

RCRE

RS

RLvs+vi-

is i2

i#

B

C

E

-+

ie

i&

;ei2

rev&e

6H#eii , -ie



84/116

+-

+

v#

-

RCRE

RS

RLvs+vi-

is i2

i#

B

C

E

-+

ie

i&

;ei2

rev&e

6H#eii , -ie



85/116



86/116

+

-

+

v#

-

RCRE

RS

RLvs+v

i-

is i2

i#

B

CE

ie

i&;ei2ii , -ie

Ri Ri R# R#

2;e&2;eei

&LC#&LC

C#2iei

iDiiD6ii

iRHHRviRR

RiiDv

=



87/116

sSi

ii v

RR

Rv

′

=

+- Ri

RS

vs+v

i-

is

B



88/116

siE

Eei i

RR

Rii

=

+- RE

RS

vs+vi-

isii ,-i

eB

Ri

Ri Ri


89/116

2;ei

2iei

iD6i

iDv

;e

ie

i

ii

D6

D

i

vR

=

O4G4 66 Ω (2ai1a!

siE

E

2i i

RR

Rii

=

iEs

i

i RHHR

i

vR =

O4G4 66 Ω (2ai1a!


90/116

2;e&

&LC#

2iei

iDi

iRHHRv

iDv

=

ie

;eLC

i

#v

D

DRHHR

v

vA =

O4G4 6? (al#!se/ invers*# de

;ase

sSi

i

i vRR

R

v

′

vSi

i

s

#

vs

ARR

R

v

vA

′

=

O4G4 66 (/9di#-al#!

se/ invers*# de

iD6i


91/116

;e

;e

LC

C

i

#i

D6

D

RR

R

i

iA

=

O4G4 6 (a'r#14 6!

iEi

E

s

#

is

ARR

R

i

iA

=

O4G4 6

2;e&

&LC

C#

2;ei

iDi

i

RR

Ri

iD6i

=

siE

E

2i i

RR

Rii

=

Deer/ina)*# das resis>n&ias de=d


92/116

sa=da

+

v#

-

RE

RS

vs , +v

i-

is i2

B

CE

ie

i&;ei2ii , -ie

R#

+

-

∞

=

=

-v&

##2;e&

22ie2;eESs

si

vR-iDi

-iiDiD6RHHR-v


93/116

R# R#

+

v#

-

+-

RC

-i#

C

B

i&

;ei2

#

-v#

##

RRR

RHHRi

vR

s

≅

=

=

= O4G4 68 Ω

(/9dia!

C! C#n


94/116

C! C#nn&ia 'ara #s

sinais AC(/%/ enre a enrada e a sa=da!

C! C#n


95/116

+-

VCC

RC

RE

RB6

RB?

CLCC

CSRS

RL

vs+v

I-

+

vO-

C

E

B

C! C#n


96/116

+-

VCC

RC

RE

RB6

RB?

CLCC

CSRS

RL

vs+vI-

+

vO-

C

E

B

CC , &a'a&i#r deaerra/en# d#


C! C#n


97/116

+-

VCC

RC

RE

RB6

RB?

CLCC

CSRS

RL

vs+vI-

+

vO-

C

E

B

CC , &a'a&i#r deaerra/en# d#


Deve ;%n&i#nar /#&%r# nas ;re$%>n&ias de#'era)*#

C&/in

RC

6


98/116

$

+-

RE

RS

RLvs

+vi-

+

v#

-RB , RB6

HHRB?

is ii

C

B

Ei#

Pass# 8 S%2si%i)*# d# TBJ '#r/#del#


99/116

/#del#

+-

RE

RB

RS

RLvs+vi-

+

v#

-

isii , i2 i#

B E

C

+ -ie

ie

;ei2

rev&e

6H#e



100/116

M#del# si/'li


101/116

M#del# si/'li


102/116

M#del# si/'li


103/116

2;eeeLE

E#2i

2;eLE##2iei

iD6iiRR

Riii

iD6RHHRvviDv

=

+

-

RERB

RS

RLvs+

vi-

+

v#

-

isii , i2 i#

B E

C

ie

ie

;ei2

Ri Ri R# R#



104/116

sSi

ii v

RR

Rv

′

=

+- Ri

RS

vs+vi-

is

B



105/116

siB

B2i i

RR

Rii

=

+- RB

RS

vs+vi-

isii , i2

B

Ri

Ri Ri

iD


106/116

2i

2;eLE#

#2iei

ii

iD6RHHRv

viDv

=

;eLEie

i

ii D6RHHRD

i

vR

O4G4 67 Ω (ala!

siB

B2i i

RR

Rii

= iBs

ii RHHR

i

vR =

O4G4 6 Ω (/9dia-ala!


107/116

2;eLE#

#2iei

iD6RHHRv

viDv

;eLEie

;eLE

i

#v

D6RHHRD

D6RHHR

v

vA

=

O4G4 6 (a'r#146!

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Amplificadores a Transistor TBJ

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