The Hall effect is a basic method for studying the performance of semiconductor materials, and the Hall sensor is a magnetic field sensor made according to the Hall effect, which is widely used in detection technology and information processing. The Hall coefficient measured by the Hall effect experiment can determine important parameters such as the conductivity type, carrier concentration, and carrier mobility of semiconductor materials. Hall sensors are divided into linear Hall sensors and switch Hall sensors.
1. Linear Hall sensor is composed of Hall element, linear amplifier and emitter follower, it outputs analog quantity.
Second, the switch-type Hall sensor is composed of a voltage regulator, a Hall element, a differential amplifier, a Schmitt trigger and an output stage, which outputs a digital quantity.
The Hall voltage changes with the strength of the magnetic field. The stronger the magnetic field, the higher the voltage, the weaker the magnetic field, and the lower the voltage. The Hall voltage is very small, usually only a few millivolts, but the amplifier in the integrated circuit can amplify the voltage enough to output a strong signal. If you want the Hall IC to function as a sensor, you need to use a mechanical method to change the magnetic field strength.