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| ISL55001_14 Datasheet, PDF (10/12 Pages) Intersil Corporation – High Supply Voltage 220MHz Unity-Gain Stable Operational Amplifier | |||
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ISL55001
V2
5V
C5
1nF
R1
C2 1kΩ
C1
1nF
V1
1nF
R2
1kΩ
+ V+
- V-
VOUT
R7
1kΩ
RB
1kΩ
RA
1kΩ
C5
1nF
V3
5V
Holp = K
wo =
1
R 1C 1R 2C 2
Q=
(1 â K )
1
R 1C 1 +
R 2C 2
R 1C 2 +
R 2C 1
R 2C 2
R 1C 1
Equations simplify if we let
all components be equal R = C
Holp = K
4â K
wo = 2
RC
Q= 2
4âK
FIGURE 26. SALLEN-KEY HIGH PASS FILTER
Differential Output Instrumentation
Amplifier
The addition of a third amplifier to the conventional three
amplifier instrumentation amplifier introduces the
benefits of differential signal realization, specifically the
advantage of using common-mode rejection to remove
coupled noise and ground potential errors inherent in
remote transmission. This configuration also provides
enhanced bandwidth, wider output swing and faster slew
rate than conventional three amplifier solutions with only
the cost of an additional amplifier and few resistors (see
Figure 27).
A1
e1
+
-
R2
RG
R3
R3
R3
R3
A3
-
eo
+
+
R3
RE
R3
eo
eo3 = â(1 + 2R2 â RG)(e1 â e2) eo4 = (1 + 2R2 â RG)(e1 â e2)
eo = â2(1 + 2R2 â RG)(e1 â e2)
BW
=
-2---f--C----1---,---2-
ADi
ADi = â2(1 + 2R2 â RG)
R2
A2
-
e2
+
A4
+
-
-
eo
R3
R3
FIGURE 27. DIFFERENTIAL OUTPUT INSTRUMENTATION AMPLIFIER
10
FN6200.3
November 3, 2009
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