AG003-01E NVE, AG003-01E Datasheet - Page 102
AG003-01E
Manufacturer Part Number
AG003-01E
Description
ASSEMBLY CURRENT SENSOR EVAL
Manufacturer
NVE
Specifications of AG003-01E
Sensor Type
Magnetic. GMR (Giant Magnetoresistive)
Interface
Analog
Embedded
No
Utilized Ic / Part
AA Series Current Sensors
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
Sensing Range
-
Other names
391-1060
- Current page: 102 of 143
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Three Op Amp Bridge Amplifier
The three op-amp circuit shown in the figure below is the most robust version of an op amp
implementation. In this circuit the CMRR still depends on the resistor ratios of the differential
amplifier (U4) but is not dependent on the resistors R1, RG, and R2. Therefore to minimize common
mode errors the gain of the first stage should be made large compared to the gain of the second stage.
The minimum gain of the second stage is dependent on amplifiers U2 and U3 output voltage range and
Op Amp U4’s common-mode input range, which for the LMC7101, is rail-to-rail allowing a gain of
one (1) in the second stage.
The DC transfer function of the circuit is:
The symmetrical nature of this configuration also allows for cancellation of common mode errors in
amplifiers U2 and U3 if the errors track.
Vout
=
V
ref
4 Vin-
8 Vin+
+
+5V
1
+
C1 0.1uF
5 Vout+
1 Vout-
2R
R
G
www.nve.com
1
T
HREE
R
R
3 +
2 -
4
3
3 +
2 -
RG
V
LMC7101A/NS
LMC7101A/NS
O
IN
P
+5V
+5V
U2
U3
R2
A
for R
phone: 952-829-9217 fax: 952-829-9189
R1
7 V+
4 V-
7 V+
4 V-
MP
C2 0.1uF
C3 0.1uF
1
P
= R
- 102 -
6
6
REAMPLIFIER
2
, R
3
R4
R3
= R
Vref
5
, R
3 +
2 -
R6
4
LMC7101A/NS
= R
C
Application Notes
+5V
IRCUIT
U4
6
R5
7 V+
4 V-
and V
C4 0.1uF
6
IN
=(V
out+
) - (V
Vout
out-
)
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