Current sensing with 1MHz bandwidth and 1.2mΩ insertion resistance is claimed by Allegro MicroSystems for its latest Hall-based sensor. Response time for the ACS730, as it is to be called, is 210ns. Being Hall-based, the sensed current path is electrically isolated from the measurement circuit so the IC can sense high-side current without an additional isolation ...
Hall current sensor reaches 1MHz bandwidth
from ElectronicsWeekly http://www.electronicsweekly.com/news/products/sensors-products/hall-current-sensor-reaches-1mhz-bandwidth-2016-05/
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