Hall sensor system biased in current

Abstract

A magnetic field sensor chip includes an input terminal configured to receive an external bias current from an external current source; an internal current generator configured to split the external bias current into a plurality of internal bias currents, including a first internal bias current and a second internal bias current; a Hall sensor configured to be biased by the first internal bias current and set at a first operating point based on the first internal bias current, wherein the Hall sensor is further configured to generate a sensor signal based on a magnetic field and the first operating point; and an amplifier configured to be biased by the second internal bias current and set at a second operating point based on the second internal bias current. The amplifier is configured to amplify the sensor signal into an amplified sensor signal based on the second operating point.