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8/10/2019 Amplificateur diffrentiel
1/4
Amp\i5rca\eur
d,;
er"nttel
'
(
o,*
$oq[.ctra
de
bare-,
e
1)_(+)
_
1Zn
c
Ve,
Vq_vr.
defi,,tI
aussi
O',
de
i,.
u,.
fa.t
",,o
G'^un
(r
g
mcl
A'n
p\;
b,
a-\.Sr.,
fe,.r
esF
idea[e
4T'
=
Aa
(t
-v.;
penf llve
,.
nc-
1jU
=
V,,
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el
eli,"ine,
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hruit
suy
e
a;
iy'rer,z)
Vtt
-
ln.
.+'
lo
ihet
;,
b,
d*t
v.
arr'Fh
sorf
ie
1n
,T
Il
esl
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eF
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l'
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14a
=
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ou
x
rnode
de
For,"lioneonenb
I
u
l"i,..1,,
{'
L
.._,,i-,r,.,v,il,,
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lgi^
gn
rnode
Co_mr",
/
a
sorlie
he
[v.
\,-\
dePend"
Pn'
(vn-vr)
y\rsa'
I
rrssi
de
(
V..
*Vr,)
=
4,
=.
So*re
en
rnoJe
G.r.an.
gn
moJe
di
ff.rern[iel
=
Tension
r\
rnoJe
d,.ff.renfie
l.
o*
ryr(tJ
=
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Cn
On
V.^
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Aa=
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=
Va
-
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en
moJe
d;fferenliel
de
qua\itd
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:
Tau,
d.
Re[ec
d
8/10/2019 Amplificateur diffrentiel
2/4
O^
.l$inrb
la
lension
dlen\r
en
rnoJe coynynuvt
Ve.
=
Vt
+Vr
e
=
l'en
sion
J'enlre
Ve.
-r
Ve/,
2
V..
_
Ved
2
er.
r*ode
dtfferenliel
Ved
=
Vr
-Vz
{;
A^p\i
5i
ca\eur
$
iS
i'e''\ie\
lransis\o's
bio\tives:
- t-'lltrir
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J
Poir,t
Q
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,[
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,
de
fer."ti6n
ehenb
Vr=Vs
=
g
)
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VcE"
=
V.e
VRenrVEe.=
V6u
vcc
=
R.rc.
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Vcn
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Re
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r
8/10/2019 Amplificateur diffrentiel
3/4
l r I
E
f
ucle-
du
mode
di
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r
-
V.a
=
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fc,,
e
Is.,
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o
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fc.r
Io
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4
_r
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el
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vr
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qu.
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+
bn
=
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_\
-)
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t
EXP(G]
L
r
))'
Jc=
1
IC,
=
8/10/2019 Amplificateur diffrentiel
4/4
Vsn
-
V5.
Vs.
-Vrz
--
-
I"Rc
Vjg
{Vr
El-uda
d.o
*ode
comm\,n
:
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=V..=Y.
+
Vtn=Vr,
,
fn
=
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-
R.
rc.)
-
(
v..
-
-R.
(f.^_r..)
R.
fc"
)
Vgr
; VBr.
V.
=.V.*Vt
_
e.
-
Vse*Rfo_V.
vsn+u.,
=
{,"+Va)
=
_
I
La
penle
o_
=
9o.,
dirninu*
Ic.
-
Io
ci-
{'
ft
(un*u,)
RE
V.
1Ve6
- *
RE
+
cte
A.
(a*\iorer
le
$rncLioxsrrr.,,
d,r
rnon'at.)
/
TRy\C
Re
p"t
un
nerafeu
"
u
coqren
=
A.
=
Gsin
en
moJe
comnun
A.
:
vt-vr..
=
R.
Io
.gV
On
re-\a.e