CURRENT SENSOR WITH CALIBRATION FOR A CURRENT DIVIDER CONFIGURATION

摘要

An integrated circuit (IC) current sensor that self-calibrates when employed in a current divider configuration is presented. The current sensor includes an integrated current conductor (152) to receive a portion of a calibration current corresponding to a full scale current, a magnetic field transducer (154), a controllable gain stage (86) and a calibration controller (84). The magnetic field transducer provides a magnetic field signal having a magnitude proportional to a magnetic field generated by the calibration current portion. The controllable gain stage amplifies the magnetic field signal with an adjustable gain to provide an amplified magnetic field signal (88). The calibration controller adjusts the adjustable gain of the controllable gain stage to a calibrated gain in order to provide the amplified magnetic field signal at a predetermined voltage level that corresponds to a desired cur- rent sensor output signal voltage level if the full scale current were received by the integrated current conductor.