AG920-07E NVE, AG920-07E Datasheet - Page 107
AG920-07E
Manufacturer Part Number
AG920-07E
Description
KIT EVALUATION GT SENSOR
Manufacturer
NVE
Specifications of AG920-07E
Sensor Type
Magnetic. GMR (Giant Magnetoresistive)
Interface
Analog
Embedded
No
Utilized Ic / Part
ABL & AKL Series GT Sensors
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
Sensing Range
-
Other names
391-1063
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Magnetic Biasing
In many applications, GMR Magnetic Field Sensors make use of biasing magnetic fields. Biasing
magnetic fields provide either a magnetic field to sense (where one is not present) or create a pseudo
zero field. Back-biasing a sensor consists of applying a magnetic field through the sensor package
without influencing the sensor. The purpose is to create a magnetic field that the device can sense for
applications where no magnetic field is present such as ferrous material detection. The figure below
shows a permanent magnet used for this purpose. The magnet adjusted in the X direction, as shown,
achieves the maximum field in the Z direction and minimum field in the sensitive X direction.
Another means of biasing a GMR Magnetic Field Sensor is to provide a constant magnetic field in the
sensitive direction. The result is a sensor biased part way up its output curve shown in the figure
below.
-30
www.nve.com
M
AA002 with Negative Bias Field Applied
AGNETIC
-20
phone: 952-829-9217 fax: 952-829-9189
B
Applie d Fie ld (Oe)
-10
IASING
- 107 -
-0.05
0.25
0.15
0.05
0.3
0.2
0.1
0
N
S
C
0
ONFIGURATION
10
Z
Application Notes
20
X
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