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参数资料
| 型号： | AG911-07E |
| 厂商： | NVE Corp/Sensor Products |
| 文件页数： | 123/145页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION GMR SWITCH |
| 标准包装： | 1 |
| 传感器类型： | 磁性 GMR（大型磁阻传感） |
| 接口： | 模拟 |
| 嵌入式： | 否 |
| 已供物品： | 3 个板，CD，磁体，样品 |
| 已用 IC / 零件： | AD 系列开关 |
| 相关产品： | AD004-00E-ND - SENSOR MAG SW 20G STNDRD 8-MSOP AD122-00-ND - SENSOR MAG SW 40G CROS AX 8-MSOP AD105-00-ND - SENSOR MAG SW 40G STANDRD 8-MSOP 391-1018-ND - SENSOR MAG SW 10G CRS AXS 8-MSOP 391-1012-ND - SENS MAG SW 28G CROS AXIS 8-MSOP 391-1010-ND - SENS MAG SW 40G CROS AXIS 8-MSOP 391-1009-ND - SENS MAG SW 20G CROS AXIS 8-MSOP 391-1008-ND - SENSOR MAG SW 28G STNDRD 8-MSOP 391-1006-ND - SENSOR MAG SW 40G STNDRD 8-MSOP 391-1005-ND - SENSOR MAG SW 20G STNDRD 8-MSOP |
| 其它名称： | 391-1062 |
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Application Notes
The same analysis was performed on the seven 0.010" wide traces of the same thickness. A voltage of
8.06V was again applied and the resulting graph is shown below in the figure below.
AA003-02 over seven 0.010" wide
0.0023" thick traces
194
192
190
188
186
184
182
180
178
176
174
mV Out = 177.74 ± 0.06(A)
@8.06V
0
0.02
0.04
0.06
0.08
0.1
0.12
Current (A)
Seven traces were run under the part so that the magnetic fields from the seven traces are additive at
the sensor thus getting a much higher output with less applied current. To a first-order approximation,
theory predicts that the field will be increased seven fold from just a single trace. The sensitivity from
the single trace above is 3.7 mV/V/A; seven times this is 25.9 mV/V/A, which is not quite achieved.
This discrepancy is due to the different current distributions. The loss would not be as extreme if seven
times the current went through the single trace.
Resolution
Resolution is a function of environmental noise. By shielding, amplifying, and filtering, the low limit
and usable resolution can be greatly increased. The data for the analysis done here was with a “raw”
setup, no amplification or filtering. In a zero gauss chamber, single microamps were detected but the
measurement equipment limited any in-depth analysis.
Effects of Biasing
For the analysis done above, a small ceramic magnet was used to supply a magnetic bias field in a
direction which is parallel to the sensitive axis of the sensor. This magnetic bias “pushes” the output to
a certain value, which is now a “psuedo zero” field point. The magnetic field from a current carrying
conductor is also directional. If a current flows in such a direction as to add to the biasing field, the
output from the sensor will increase. Likewise, if a current flows in the opposite direction, its resultant
field will subtract from the biasing field, and the output will decrease. This directionality can be seen
by looking at the output slopes of the previous two graphs. In the first graph, the output displayed
shows the current produced a field opposite to the biasing magnetic field. Thus showing as the current
increases, the output of the sensor decreases. In the same respect, the second graph shows that the field
from the current was in the same direction as the biasing field.
- 123 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
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