Sensor device for measuring current in electrical circuit

A sensor device for measuring current in an electrical circuit of a printed circuit board (PCB), the sensor device comprising:

• a coaxial connector mounted on a part of the PCB that includes the electrical circuit, the coaxial connector comprising an inner conductor and a concentric outer conductor, the concentric outer conductor being connected to a ground plane of the PCB through a via connection in the PCB;
• a plurality of resistors mounted on the PCB and arranged along a portion of a perimeter surrounding the coaxial connector, each resistor of the plurality of resistors being connected between the inner conductor of the coaxial connector and the ground plane of the PCB;
• and
• a conductive cover arranged over the plurality of resistors, and connected between the concentric outer conductor of the coaxial connector and the ground plane of the PCB,
• wherein current from the electrical circuit flows in a first direction through the ground plane of the PCB creating a first magnetic field, flows in a second direction through the plurality of resistors creating a second magnetic field, and further flows in the first direction through the conductive cover creating a third magnetic field, wherein the first and third magnetic fields cancel at least a portion of the second magnetic field.

A sensor device for measuring current in an electrical circuit of a printed circuit board (PCB), the sensor device comprising:

• a coaxial connector mounted on a tab in the PCB and comprising an inner conductor and a concentric outer conductor, wherein the tab is formed by a gap through the PCB along a portion of a perimeter surrounding the coaxial connector;
• bottom plating formed on a bottom surface of the tab and connected to ground;
• sidewall plating formed on sidewalls of the tab and connected to the bottom plating, the sidewalls being defined by the gap through the PCB;
• a plurality of resistors mounted on the tab and arranged along the portion of the perimeter surrounding the coaxial connector, each resistor of the plurality of resistors being connected between the inner conductor of the coaxial connector and the side plating;
• and
• a conductive cover mounted on the tab and arranged over the plurality of resistors, the conductive cover being connected between the concentric outer conductor of the coaxial connector and the side plating,
• wherein the concentric outer conductor of the coaxial connector is connected to the bottom plating through a via connection in the tab, and
• wherein current from the electrical circuit flows in a first direction from the bottom plating toward the sidewall plating creating a first magnetic field, flows in a second direction from the sidewall plating toward the inner conductor of the coaxial connector through the plurality of resistors creating a second magnetic field, and further flows in the first direction from the concentric outer conductor of the coaxial connector toward the sidewall plating creating a third magnetic field, wherein the first and third magnetic field substantially cancel the second magnetic field.