Allegro Technology Solutions

GMR Logo

Giant Magnetoresistance (GMR) Sensor Technology

GMR offers the ability to improve signal to noise, increase resolution, or reduce the required field level for a given solution (smaller magnets, larger air gaps, etc.). Additionally, sensing in-plane to the wafer or IC surface gives the ability to create new, more robust, differentially magnetic solutions than possible with through-plane sensitive Hall technology.
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Hall-Effect Sensor Technology

Allegro Hall-effect sensor integrated circuits (ICs) incorporate a Hall element with other circuitry, such as op-amps and comparators, to make digital position sensors and speed sensors, as well as linear and angle sensors with analog outputs.

Allegro has pioneered several major advances in the field of Hall-effect sensor ICs including chopper stabilization, vertical Hall-effect technology, circular vertical Hall (CVH) arrays, and non-intrusive high-speed hardware diagnostics. Visit each section below to learn more.

 

Hall-Effect Overview and Applications
The effect of a magnetic field on the current through a conductor (the "Hall effect") was first discovered in 1879. Today, Allegro leverages this fundamental property of physics, along with modern semiconductor technology, to build speed, position, linear, angle, and current sensors.
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Chopper Stabilization
The signals produced by the Hall effect within an integrated circuit are tiny—possibly only microvolts of signal. This signal can easily be corrupted by noise or offsets such as those induced by temperature changes or mechanical stress. State-of-the-art sensors employ chopper stabilization to cancel out these effects.
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Vertical Hall LogoMulti-Dimensional Sensing
Traditional Hall-effect sensors are only sensitive to magnetic fields perpendicular to the plane of the die. Sophisticated design and fabrication techniques have made it possible to create vertical Hall elements that allow a sensor to determine field direction as well as magnitude. This can be leveraged to build more sensitive switches, better rotary position sensors, and angle sensors.  
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Diagnostics for Built-In Self-Test (BIST)
Hall-effect sensors are often used in safety-critical applications, including automobiles. The development of fast, non-intrusive self-diagnostics (BIST) has enabled sensors to meet the most stringent safety standards including ISO 26262:2011.
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