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#Solid State Magnetometers
**Page Under Construction**<br>
This page describes the types and some of the theory about solid state magnetic sensing
##Types
-Hall Effect<br>
-AMR<br>
Hard Axis/Easy Axis<br>
-GMR<br>
-SDT<br>
##Sources of Error 
-Thermal offset<br>
-Cross axis<br>
-External<br>
-Bridge Offset <br>
--Manual Trim<br>
--Offset Strap<br>
--Digital Subtraction<br>
--Electronic Feedback<br>
###Noise
-1/f<br>
-Barkhausen<br>
-White/thermal (Johnson?)<br>

##Links! Lots of Lovely Links.
**TO DO: sort out the good stuff**<br>
Much more to come
###Recomended Links
Describes the physics and construction of an AMR sensor [Magnetoresistive Sensors](http://www.iemw.tuwien.ac.at/publication/workshop0600/Hauser.html) (Hauser, Stangl, Fallmann, Chabicovsky, & Riedling | 2000?)<br>
Excellent article on AMR sensors and their operation from [SensorsMag](http://archives.sensorsmag.com/articles/0399/0399_18/main.shtml) (see the electronic feedback and closed loop sections) <br>
Comparison of AMR and Hall sensors from [SensorMag](http://www.sensorsmag.com/sensors/article/articleDetail.jsp?id=314520&pageID=1&sk=&date=)<br>
Introduction to many types of magnetic sensing including solid state, SQUID, fluxgate, etc. From [SensorsMag](http://www.sensorsmag.com/articles/1298/mag1298/main.shtml)<br>

###Vendors
AMR:[Honeywell](http://www.magneticsensors.com/)(TO DO: Go through application notes) We will probably be using sensors from this company. Everything below is somewhat useless, although they may have good application notes<br>
AMR/GMR:[Sensitec](http://www.sensitec.com/en/index.php?s=3,1,0) (Do they have anything interesting?)<br>
AMR:[NXP](http://www.nxp.com/#/homepage/cb=[t=p,p=/50813/16745]|pp=[t=pfp,i=16745]) It looks like they stopped making weakfield sensors, but the ANs are good<br>
GMR/SDT:[NVE](http://www.nve.com/index.php)<br>
Hall/AMR:[iC-Haus](http://www.ichaus.de/productgroup.php?grp=Magnetic_Sensors)<br>
AMR:[HL-Planar Technik](http://cms.hlplanar.de/index.php?spath=329&lan=1&) Has same part numbers as NXP?<br>
AMR(?):[Yamaha](http://www.yamaha.co.jp/english/product/lsi/prod/sensor/index.html) 3-axis aren't out yet?<br>
Hall:[Asahi Kasei EMD](http://www.asahi-kasei.co.jp/ake/en/product/index.html) They had a 3-axis geomagnetic sensor but I can't find it now.<br>
Hall:[Micronas](http://www.micronas.com/automotive_and_industrial_products/index.html?backurl=%2Fproducts%2Findex.html) Probably not useful<br>
Hall:[Allegro](http://www.allegromicro.com/en/Products/Categories/Sensors/index.asp)<br>
Hall interface:[Maxim](http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5410)<br>
Hall:[Infineon](http://www.infineon.com/cms/en/product/channel.html?channel=ff80808112ab681d0112ab68f47200a6)

###Other Links
General information on all types of magnetic stuff [Brooke's Sensors page](http://www.prc68.com/I/Sensors.shtml#EMF)(need to read it and find relevant information)<br>
Random PSAS wiki page with links (move to better area?)[[Random Wiki magnetometer page|MagnetometerBoard]]<br>
A magnetometer discussion page and group, has some designs and links to other pages [The Magnetometer Group](http://www.magnetometer.org/) (To Do: examine their discussion group)<br>
Wikipedia page on Magnetoresistance (not very good) [Magnetoresistance](http://en.wikipedia.org/wiki/Magnetoresistance)<br>
An example of an electronic compass for use in [robots](http://www.superdroidrobots.com/product_info/compass.htm)<br>
Fully functional micro-compasses from [Ocean Server](http://www.ocean-server.com/compass.html)<br>
GMR Lowfield sensing overview from [SensorMag](http://www.sensorsmag.com/sensors/Technologies+In+Depth%2FElectric%2FMagnetic/Low-Magnetic-Field-Sensing-with-GMR-Sensorsbr-Part/ArticleStandard/Article/detail/325285) (need to find part 2)<br>

###Mailing Lists
OpenMoko brief discussion on using a magnetometer for use in a [cellphone](http://lists.openmoko.org/pipermail/community/2008-September/029311.html) Try to find if they came up with anything?<br>
OpenAHRMS [Discussion](http://svcs.cs.pdx.edu/pipermail/openahrms/2008-April/000119.html) [more](http://svcs.cs.pdx.edu/pipermail/openahrms/2008-March/000037.html)