AG920-07E NVE, AG920-07E Datasheet - Page 92

• 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

Application Notes
This confusing result is often seen when trying to detect very small magnetic fields such as the earth’s
field in magnetic compass applications or currency detection applications. The solution to this problem
is to bias the sensor element with an external magnetic field, so that the operating point of the sensor is
on the linear portion of the characteristic curve. This can be done either with an external permanent
magnet, or a current running near the sensor. Biasing the sensor with a positive external field from a
magnet or current will shift the sensor’s output characteristic as shown below:
Voltage
Output
- Applied Field
+ Applied Field
With this approach, a small applied field to the sensor will result in a bipolar output signal.
Furthermore, the slope of the signal characteristic will be the same no matter which curve the sensor is
operating on. So, the magnetic sensitivity of the device is the same, no matter how much hysteresis the
sensor has.
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