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Application Notes
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.
N
Z
S
X
M AGNETIC B IASING C ONFIGURATION
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.
AA002 with Negative Bias Field Applied
0.3
0.25
0.2
0.15
0.1
0.05
0
-30
-20
-10
0
10
20
-0.05
Applie d Fie ld (Oe)
- 107 -
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相关PDF资料
123-5863-12-163 LED BASE MINI PNL IND OIL TIGHT
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