Editing Hall effect sensor (section)

=== Amplification ===
Hall effect devices produce a very low signal level and thus require amplification. The [[vacuum tube]] [[amplifier]] technology available in the first half of the 20th century was too large, expensive, and power-consuming for everyday Hall effect sensor applications, which were limited to laboratory instruments. Even early generation [[transistor]] technology was unsuited; it was only with the development of the low-cost [[silicon chip]]-based [[integrated circuit]] (IC) micro-technology that the Hall effect sensor became suitable for mass application. Devices sold as Hall sensors nowadays contain both the sensor as described above and a high gain IC amplifier in a single package. These Hall sensor ICs may add a stable [[voltage regulator]] in addition to the amplifier to allow operation over a wide range of [[voltage source|supply voltage]] and boost the Hall voltage for a convenient analog signal output proportional to the magnetic field component.<ref name=":0" /> In some cases, the linear circuit may cancel the offset voltage of Hall sensors. Moreover, AC modulation of the driving current may also reduce the influence of this offset voltage.

Hall sensors are called ''linear'' if their output is proportional to the incident magnetic field strength. This output signal can be an [[Analog signal|analog]] voltage, a [[pulse-width modulation]] (PWM) signal, or be [[Digital communication|communicated digitally]] over a modern [[Bus (computing)#Examples of internal computer buses|bus protocol]].<ref>{{Cite web |title=Linear Hall Sensors (product category) |url=https://product.tdk.com/en/products/sensor/linear/linear-hall/index.html |url-status=live |archive-url=https://web.archive.org/web/20230205002539/https://product.tdk.com/en/products/sensor/linear/linear-hall/index.html |archive-date=2023-02-05 |access-date=2024-01-02 |website=[[TDK]]}}</ref> Hall sensors may also be ''ratiometric'' if their sensitivity is also proportional to their supply voltage. With no magnetic field applied, their ''quiescent output voltage'' is typically half of the supply voltage.<ref>{{Cite web |last1=Gilbert |first1=Joe |last2=Dewey |first2=Ray |date=2022-05-05 |title=AN27702: Linear Hall-Effect Sensor ICs |url=https://www.allegromicro.com/-/media/files/application-notes/an27702-linear-hall-effect-sensor-ics.pdf |url-status=live |archive-url=https://web.archive.org/web/20231104000208/https://www.allegromicro.com/-/media/files/application-notes/an27702-linear-hall-effect-sensor-ics.pdf |archive-date=2023-11-04 |access-date=2024-01-02 |website=[[Allegro MicroSystems]]}}</ref> They may have [[Rail-to-rail opamp|rail-to-rail]] output (e.g., A1302).<ref>{{cite web|url=https://www.jameco.com/Jameco/Products/ProdDS/2135881.pdf|title=A1301 & A1302 - Continuous-Time Ratiometric Linear Hall Effect Sensor ICs|publisher=Allegro MicroSystems|website=www.jameco.com|archive-url=https://web.archive.org/web/20240103012358/https://www.jameco.com/Jameco/Products/ProdDS/2135881.pdf|archive-date=3 January 2024|url-status=live}}</ref>