Ηλεκτρονική ΙΙ - 1
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Transcript of Ηλεκτρονική ΙΙ - 1
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A.
311311::
20020055--20062006
11::
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1 2
3
4 5
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. dc
. . ( 1 .22)
( ) . 1 2 .
2u1u
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A.
. .
. ,
12 uu
Vuu 121 ==
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A.
. .
2R2R
2R
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A.
. .
(virtual ground)
i
o
uuG =
012 = Auuu o
1u2u
1u 2 . 1
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.
,
. , .
1R1
0
1
11
1
Ru
Ruui I
uI
===
2R
21
22211 021
RRuRiRiuu I
ii
o ====
1
2
RR
uuGI
O ==
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A.
. , .
, .
AuO
AuO
1i 1R11
1 RA
uu
RA
uui
OI
OI +=
=
1i 2R
21
21 RRA
uu
AuRi
Auu
OIOO
O
+==
AR
RR
R
uuGI
O
++
==
1
2
1
2
11
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A.
( )
, . , (. ).
1
1
RR
uuRI
Iin ==
( )12 uuA
inR 1R
1
2R
R2R
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A.
( )
1R 2R1Z 2Z
1
2
ZZ
VV
i
O =
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Miller
Miller CR
RZ =1 sCZ1
2 = sCRVVi
O 1=
== t
ICOi
O dttuCR
VtusCRV
Vt
0
)(1)(10
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A.
Miller
( s=0)
dc .
dc.
0 dB ( ) ( )CR1
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A.
, CR
sCZ 11 = RZ =2 sCRV
V
i
O =
dttduCRtusCR
VV I
Oi
o )()( ==
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,
0 dB
CR1=
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A.
1i 2i ni, ,
1
11 Rui =
2
22 Rui =
n
nn Rui =
. . .
, , . . .
niiii +++= ...21fR
ffO iRiRu == 0
+++= n
n
fffO uR
Ru
RR
uRR
u ...22
11
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A.
,
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A.
,
Iu
1R
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A.
,
,
012 == Auuu O
Iu
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A.
.
1R 1RuI
2R
21
RRuuu IIO
+=
1
21RR
uu
I
O +=
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A.
, .
( )12 uuA
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A.
. (buffer amplifier)
.
02 =R =1R
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.
(
3 dB
bf
tf
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A.
()
. ( )
)(sA
b
O
sAsA+
=1
)(
js =
jAjAj
AjA bO
b
O b +
= >> )(1
)(
bOtt AjA ==1)(
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A.
1A
2A
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A.
E
)()()(sVsVsA
id
o=
2io VV =
YVGV idmi
=2 ( )++= 11 sCRY ( )RsCRGVV midi ++= 112,
( )RsCRG
sVsVsA m
id
o
++== 11)()()(
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E
RGA mo = ( )RCb += 11
( )RCRGA mtbot
+== 1
,
1>>
CGm
t
b >>
sCGsA m)(
1>>
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(Output Saturation)
. , 1 3 Volts
+L L
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A.
(Slew Rate)
) )
) , V
) , V
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A.
(Slew Rate)
. . ,
=+=
t
o
ti
o eVtusVV 1)(
11
,t 1=
maxdtduSR o=
maxI
CImax
CISR max=
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,
Mf
SRVom =max
max2 VoM
SRf =
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, ac (common mode gain). ,
.
icmu
oucmA
icmu
1u 2u12 uuuid =
221 uuuicm
+=
icmcmido uAAuu += cm
cmAA
CMRR =cmAA
CMRR log20= dB
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:
RinR1
,
0=oR icmRR
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( ) ( )
. :
( ) ( )( )( ) ( ) idicmin
idd
in
dididin
idinid
RARR
RAiv
iRAvAv
AvRR
RvRR
Rvv
+=+=
+=+=+=+=+
12
1
1121
10
21
1
21
1
RRR+=
vid+
-
i2
i1
R1
R2
voRidid
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A.
(
)
xV
IVR xout =
xx VRRRVV =+= 211
o
xx
RAVV
RRVI ++= 21
( )o
xx
RVA
RRV +++=
1
21
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()
oxout RA
RRVR+++==
1111
21
[ ] ( ) ARRA
RRRR ooutRRRo
outo
+
++= +< 11//21
21
A+1
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dcdc
.
. 1-5 mV (TC V/oC)
0 V, dc . , . (input offset voltage Vos)
Vos
-VOS
vo
vin
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dcdc
dc, Vos
Vos
Vos
+=1
21RRVV oso
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dcdc ( 1)( 1)
.
dc, dc
, 3 dB
dc Vos
1
1CRo =
1
2R
R o >>
+1
21 RRVos
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dcdc ( 2)( 2)
Miller Integrator :
, v0 RF C H RF VOS/R, DC v0
+ RRV Fos 1
RFt
RCVVdt
RV
CVv OSOS
tOS
OS +=+= 0
01
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dcdc
,
dc,
IB1 IB2
221 BB
BIII +=
21 BBos III +=
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dcdc
,
221 RIRIV BBo =2R
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dcdc
.
3R3R
+=1
321232 R
RIIRRIV BBBo
BBB III == 21
+=1
232 1 R
RRRIV Bo
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dcdc
Vo ,
Ios
3R
21
21
1
2
231 RR
RR
RRRR +=+
=
3R2R
1R
3R
2RIV oso = 3R
