Circuitry for detecting magnetic fields includes a first magnetoresistive sensor and a second magnetoresistive sensor configured to form a gradiometer. The circuitry includes a digital signal processor and a first feedback loop coupled between the first magnetoresistive sensor and the digital signal processor. A second feedback loop which is discrete from the first feedback loop is coupled between the second magnetoresistive sensor and the digital signal processor.
This invention was made under a Cooperative Research and Development Agreement between The Walt Disney Company and Battelle Energy Alliance, LLC, under Contract DE-AC07-05-ID14517 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.