Digital signal conditioning solution for a magnetometer circuit

Details Digital signal conditioning solution for a magnetometer circuit Digital signal conditioning solution for a magnetometer circuit

2006-08-29

2006-08-29

Lefkowitz, Edward (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S253000, C324S209000, C073S862333

Reexamination Certificate

active

07098658

ABSTRACT:
A fluxgate magnetometer including a fluxgate and a digital processor. The digital processor includes an analog to digital converter for digitizing the back EMF from the fluxgate and a signal generator to generate the fluxgate driving signal. Further, a current sourcing circuit is provided to receive the fluxgate driving signal from the signal generator and transmit a current amplified driver signal to the fluxgate capable of driving the fluxgate in and out of saturation. The signal generator is a pulse width modulator used in conjunction with a voltage shaper and driver to create a triangle-shaped driving signal to excite the fluxgate. The digital processor is further configured to reverse the sign of the digital back EMF signal at a frequency corresponding to two times the frequency of the fluxgate driving signal thereby capturing only the second harmonic of the back EMF signal.

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