Fluxgate device with low fluxgate noise

An integrated circuit, comprising:

• a semiconductor substrate;
• a circuit having transistor regions in the semiconductor substrate;
• and
• a fluxgate device positioned above the circuit, the fluxgate device including:
• a magnetic core having a longitudinal edge and a terminal region;
• a first coil coupled to the circuit, the first coil coiling around the longitudinal edge of the magnetic core and extending to the terminal region;
• and
• a second coil coupled to the circuit, the second coil coiling around the longitudinal edge of the magnetic core and terminated outside the terminal region.

An integrated circuit, comprising:

• a semiconductor substrate;
• a circuit having transistors formed in the semiconductor substrate;
• and
• a fluxgate device positioned above the circuit, the fluxgate device including:
• a magnetic core having a longitudinal edge and a terminal region;
• a dielectric layer having an extension region abutting the terminal region of the magnetic core;
• a first coil coupled to the circuit, the first coil coiling around the longitudinal edge of the magnetic core, the first coil extending to the terminal region of the magnetic core and the extension region of the dielectric layer;
• and
• a second coil coupled to the circuit, the second coil coiling around the longitudinal edge of the magnetic core and terminated before reaching the terminal region of the magnetic core.