W09_Operational Amplifier.pdf

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Operational Amplifier
Op-Amp
Op-Amp block diagram
C
(+)
V
in
(-)
Diff
amp
gain
output
follower
Op-Amp model
1
uA741 - inside
LF155/157
Typical Op-Amp parameters
Parameter
OL gain
Unity gain frequecy
Input resistance
Output resistance
Input bias
Input offset current
Input offset voltage
CMRR
Symbol
A
VOL
f
T
R
in
R
out
I
in(bias)
I
in(off)
V
in(off)
CMRR
Perfect
op-amp
infinite
infinite
infinite
zero
zero
zero
zero
infinite
uA741
100000
1Mhz
2MΩ
75Ω
80nA
20nA
2mV
90dB
LF157
200000
20MHz
10
12
Ω
100Ω
30pA
3pA
1mV
100dB
2
More Op-Amp parameters
wzmocnienie różnicowe
Pole wzmocnienia
3dB częstotliwość graniczna
k
UD
[dB]
-3dB
20dB/dec
0 dB
f
cA
f
T
More Op-Amp parameters
3
Common Mode Rejection Ratio
-
+
U
inS
V
OUT
=
V
inS
CMRR
[
V
/
V
]
More Op-Amp parameters
Input offset voltage
-
U
0
V
OUT
=
0
+
-
U
0
=0
V
OUT
=
A
v
V
off
+
4
More Op-Amp parameters
Inpu bias current
V
R
=
I
B
1
R
-
+
V
R
=
I
B
2
R
V
out
(
off
)
=
(
I
B
1
−
I
B
2
)
RA
v
=
I
bias
(
off
)
RA
v
More Op-Amp parameters
5

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