Systems and Methods for Processing Temperature Data or Other Signals

An apparatus comprising:

• a circuit configured to produce a magnetic field signal having a frequency spectrum, wherein the magnetic field signal is responsive to a magnetic field external to the apparatus;
• a temperature sensing circuit configured to produce a temperature signal;
• a first modulation circuit configured to modulate the temperature signal to a frequency outside the frequency spectrum of the magnetic field signal, resulting in a first modulated signal;
• and
• a combining circuit configured to combine the magnetic field signal with the first modulated temperature signal to produce a combined signal.

A magnetic field sensor comprising:

• a back bias magnet configured to generate a magnetic field;
• a circuit configured to produce an magnetic field signal having a frequency spectrum, wherein the magnetic field signal represents a strength of an ambient magnetic field;
• a temperature sensing circuit configured to produce a temperature signal for calibrating the magnetic field signal;
• a first modulation circuit configured to modulate the temperature signal to a frequency outside the frequency spectrum of the magnetic field signal, resulting in a first modulated signal;
• a combining circuit configured to combine the magnetic field signal with the first modulated temperature signal to produce a combined signal;
• and
• an output operative to provide the combined signal to a digital processing circuit.

A method of sensing temperature comprising:

• producing a first signal having a frequency spectrum, wherein the first signal is responsive to a magnetic field;
• producing a second signal;
• modulating the second signal to a frequency outside the frequency spectrum of the first signal resulting in a first modulated signal;
• combining the first signal with the first modulated signal to produce a combined signal;
• and
• extracting the second signal from the combined signal.