Patent ID: 9465056
Filing Date: 2016-10-11
CPC Classification: G01R

Claim Text:
1. A single chip current sensor comprising a magnetic tunnel junction (MTJ) sensor bridge containing one or more MTJ resistors, an electric conductor in the vicinity of the sensor bridge that carries a test electric current, and at least one MTJ temperature compensation resistor, wherein two magnets are placed on opposing sides of the one or more MTJ temperature compensation resistors producing a magnetic field to bias the free layer of the MTJ elements in the one or more temperature compensation resistors such that the direction of the magnetization of the free layer of each of the MTJ elements in the temperature compensation resistors is anti-parallel to the direction of the magnetization of its pinned layer, such that the one or more MTJ temperature compensation resistors are in a high resistance state that only changes as the function of temperature in the measurement range of the current sensor, wherein the sensor bridge is connected in series with the one or more MTJ temperature compensation resistors so as to stabilize the sensor bridge voltage output, and the sensor bridge determines the test electric current by measuring the magnetic field produced by the test electric current in the electric conductor which is then provided as an output voltage.