AG911-07E NVE, AG911-07E Datasheet - Page 101
![KIT EVALUATION GMR SWITCH](/photos/9/20/92014/ag911-07e_sml.jpg)
AG911-07E
Manufacturer Part Number
AG911-07E
Description
KIT EVALUATION GMR SWITCH
Manufacturer
NVE
Specifications of AG911-07E
Sensor Type
Magnetic. GMR (Giant Magnetoresistive)
Interface
Analog
Embedded
No
Utilized Ic / Part
AD Series Switches
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
Sensing Range
-
Other names
391-1062
- Current page: 101 of 143
- Download datasheet (2Mb)
Two Op Amp Bridge Amplifier
The two op amp circuit shown below reduces the loading of the preamplifier on the NVE bridge
outputs but still has a CMRR that is dependent on the ratio of resistor matching. The AC CMRR is also
poor in that any delay of the common mode signal through op amp U2 provides a mismatch in the
signals being delivered to op amp U3 for cancellation. Its advantages are simplicity and low cost.
The equation for DC gain of the two op amp circuit (assuming infinite input impedance of the op
amps) is:
Vout
=
V
ref
8 Vin+
4 Vin-
+
V
+5V
IN
Vref
1
C1 0.1uF
5 Vout+
1 Vout-
+
www.nve.com
R
R
T
R4
2
1
WO
+
3 +
2 -
O
LMC7101A/NS
P
2R
R
A
G
+5V
phone: 952-829-9217 fax: 952-829-9189
2
U2
MP
7 V+
4 V-
R3
C2 0.1uF
P
RG
- 101 -
REAMPLIFIER
for
6
R
R
R1
2
1
=
3 +
2 -
C
R
R
LMC7101A/NS
IRCUIT
4
3
Application Notes
and V
+5V
U3
R2
7 V+
4 V-
C3 0.1uF
6
IN
= (V
out+
Vout
) - (V
out-
)
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