Magnetic field sensors having a magnetic anti-aliasing filter

A method comprising:

• generating a first magnetic field signal indicative of a first magnetic field experienced by a first magnetic field sensing element, the first magnetic field sensing element supported by a substrate;
• generating a second magnetic field signal indicative of a second magnetic field experienced by a second magnetic field sensing element, the second magnetic field sensing element supported by the substrate;
• reducing a bandwidth of the first magnetic field by a first amount using at least one shield;
• and
• reducing a bandwidth of the second magnetic field by a second amount using the at least one shield, wherein the second amount by which the at least one shield reduces the bandwidth of the second magnetic field signal is approximately zero.

A magnetic field sensor comprising:

• a substrate;
• a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element, wherein the first channel further comprises a switching circuit coupled to receive the first magnetic field signal and configured to generate a sampled signal;
• a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element;
• and
• at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount, wherein the at least one shield is configured to reduce aliasing of the sampled signal.

A magnetic field sensor comprising:

• a substrate;
• a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element, wherein the first channel further comprises a switching circuit coupled to receive the first magnetic field signal and configured to generate a sampled signal, and wherein the switching circuit comprises a chopping circuit configured to chop the first magnetic field sensing element;
• a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element;
• and
• at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount.

A magnetic field sensor comprising:

• a substrate;
• a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element, wherein the first channel further comprises a switching circuit coupled to receive the first magnetic field signal and configured to generate a sampled signal, and wherein the switching circuit comprises an analog-to-digital converter configured to convert the first magnetic field signal into a digital signal;
• a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element;
• and
• at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount.

A magnetic field sensor comprising:

• a substrate;
• a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element;
• a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element;
• and
• at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount;
• and
• a lead frame supporting the substrate, wherein the at least one shield comprises a die attach pad of the lead frame that is disposed under the first magnetic field sensing element and is not disposed under the second magnetic field sensing element.

A magnetic field sensor comprising:

• a substrate;
• a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element;
• a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element;
• and
• at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount, wherein the at least one shield comprises a conductive layer disposed over the first magnetic field sensing element and not disposed over the second magnetic field sensing element.

A method comprising:

• generating a first magnetic field signal indicative of a first magnetic field experienced by a first magnetic field sensing element, the first magnetic field sensing element supported by a substrate;
• generating a second magnetic field signal indicative of a second magnetic field experienced by a second magnetic field sensing element, the second magnetic field sensing element supported by the substrate;
• reducing a bandwidth of the first magnetic field by a first amount using at least one shield;
• reducing a bandwidth of the second magnetic field by a second amount using the at least one shield;
• and
• generating a sampled signal from the first magnetic field signal and reducing aliasing of the sampled signal.

A method comprising:

• generating a first magnetic field signal indicative of a first magnetic field experienced by a first magnetic field sensing element, the first magnetic field sensing element supported by a substrate;
• generating a second magnetic field signal indicative of a second magnetic field experienced by a second magnetic field sensing element, the second magnetic field sensing element supported by the substrate;
• reducing a bandwidth of the first magnetic field by a first amount using at least one shield;
• reducing a bandwidth of the second magnetic field by a second amount using the at least one shield;
• and
• chopping the first magnetic field sensing element.