- 您现在的位置：买卖IC网 > PDF目录17123 > AG911-07E (NVE Corp/Sensor Products)KIT EVALUATION GMR SWITCH PDF资料下载
参数资料
| 型号： | AG911-07E |
| 厂商： | NVE Corp/Sensor Products |
| 文件页数： | 89/145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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页当前第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页
Application Notes
Hysteresis in GMR Sensors
All magnets and magnetic materials (iron, nickel, etc.) have magnetic hysteresis. Hysteresis refers to
the history of the magnetic field applied to the material and how it affects the material properties and
performance. NVE’s GMR sensors are made of magnetic materials, so they are subject to hysteresis
effects.
Hysteresis can make GMR sensors easier or harder to use, depending on the application. In nearly all
digital applications, hysteresis is desirable because it prevents “jitter” at the sensor operate point. With
sensor elements that do not have hysteresis, electrical hysteresis is normally built into the signal
processing electronics.
In a linear application, hysteresis can be problematic, but this depends on the application. For example,
if a GMR sensor is used as a current sensor, and it is detecting the magnetic field from a repetitive
current such as a sinusoidal waveform, then the recent magnetic history at sensor will always be the
same. This will result in repeatable output from the sensor at each current level. In this case, hysteresis
is not an issue. Another important point is that time is not a factor, only the magnitude of the fields that
the sensor is exposed to. For example, if the frequency of the current’s sinusoidal waveform changes,
or if the current stops at a given level for some period of time, and then restarts in the same sinusoidal
pattern, there will be no hysteresis effects at the sensor.
On the other hand, if the magnetic field to be detected is not repetitive in magnitude, but more random
in nature, then an error can result in the sensor output reading. The size of this error will depend on the
amount of hysteresis in the sensor element and the difference in the polarity and magnitudes of the
applied fields that the sensor was recently exposed to. The error will take the form of a voltage offset
change in the sensor element.
Because the error is essentially an offset change, it can be eliminated in cases where the signal is high
in frequency by AC coupling the output of the sensor to an amplifier. This is a common solution in
applications such as currency detection where a very small signal that can be random in nature must be
detected from a moving object. AC coupling and a high gain amplifier are employed to see this small
signal with GMR sensors.
If DC coupling the sensor to an amplifier or output stage is required, and the magnetic field will not be
repeatable, then the hysteresis in the sensor element must be taken into account as a potential error in
the reading. For NVE’s AA-Series sensors, this potential error can be as high as 4% if the sensor is
exposed to one polarity of magnetic field (unipolar mode of operation), and as high as 20% if the
sensor is exposed to a bipolar field. However, even in these cases the large output signal of the GMR
sensor elements can provide advantages over other technologies.
The polarity of the magnetic field that is applied to the sensor has a strong effect on the amount of
hysteresis. Unipolar operation is when the applied magnetic field at the sensor is always in the same
polarity, or direction. Bipolar operation is when the magnetic field at the sensor changes direction.
Hysteresis is much more exaggerated in the sensor element when a bipolar magnetic field is applied to
the sensor.
- 89 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
相关PDF资料 |
PDF描述 |
|---|---|
| EBM28DSXS | CONN EDGECARD 56POS DIP .156 SLD |
| 39S681C | INDUCTOR 0.68UH 19.5A SMD |
| 0210390901 | CABLE JUMPER 1MM .051M 21POS |
| 0210390900 | CABLE JUMPER 1MM .051M 21POS |
| EBM28DRTH | CONN EDGE DUAL .156 DIP 56POS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AG9120-S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power-Over-Ethernet Module |
| AG-91D08-ES | 制造商:TE Connectivity 功能描述: |
| AG91D-12 | 制造商:TE Connectivity 功能描述: |
| AG91D15-ES | 制造商:TE Connectivity 功能描述: |
| AG920-07 | 功能描述:KIT EVALUATION GT SENSOR RoHS:否 类别:编程器，开发系统 >> 评估板 - 传感器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
发布紧急采购，3分钟左右您将得到回复。