Systems and methods for a high isolation current sensor

A current sensor comprising:

• a lead frame comprising at least two leads coupled together to form a primary conductor to carry a first portion of a primary current and a signal lead spaced from the at least two leads to carry an output signal of the current sensor having a level indicative of a level of the primary current;
• a semiconductor substrate having a first surface distal from the lead frame, the first surface supporting a magnetic field sensing circuit and a conductive layer electrically isolated from the magnetic field sensing circuit, the semiconductor substrate further having a second opposing surface proximal to the lead frame;
• and
• at least two interconnects coupled between the primary conductor and the conductive layer, wherein a second portion of the primary current flows through the conductive layer and wherein the magnetic field sensing circuit comprises one or more magnetic field sensing elements to sense the second portion of the primary current;
• wherein the magnetic field sensing circuit further comprises a calibration circuit configured to calibrate a sensitivity of the magnetic field sensing circuit in response to a difference between a measured level of the current sensor output signal for a selected primary current level and a predetermined level of the current sensor output signal for the selected primary current level.