MAGNETIC FIELD SENSOR WITH IMPROVED ACCURACY AND METHOD OF OBTAINING IMPROVED ACCURACY WITH A MAGNETIC FIELD SENSOR
First Claim
1. A magnetic field sensor, comprising:
- a circular vertical Hall (CVH) sensing element comprising;
a plurality of vertical Hall elements, each one of the plurality of vertical hall elements comprising respective first and second current receiving contacts, respective first and second output signal generating contacts, and a respective at least one reference contact, wherein the at least one reference contact is positioned between the first and second current receiving contacts, the first output signal generating contact is positioned between the at least one reference contact and the first current receiving contact, and the second output signal generating contact is positioned between the at least one reference contact and the second current receiving contact;
wherein the plurality of vertical Hall elements is configured to generate a plurality of magnetic field signals, each magnetic field signal responsive to a magnetic field;
the magnetic field sensor further comprising;
a sequence switches circuit coupled to the plurality of vertical Hall elements, wherein the sequences switches circuit is operable to sequentially select from among the plurality of vertical Hall elements to generate sequenced signal steps;
a first current source sequentially coupled by the sequence switches circuit to the first current receiving contact of sequentially selected ones of the plurality of vertical Hall elements, and operable to provide, at first sequential times, a first current signal to the first current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements;
a second current source sequentially coupled by the sequence switches circuit to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements and operable to provide, at the same first sequential times, a second current signal to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements; and
an amplifier circuit coupled to receive the sequenced signal steps produced at the first and second output signal generating contacts of the sequentially selected ones of the plurality of vertical Hall elements, and, in response to the sequenced signal steps, the amplifier circuit is configured to generate an amplified signal representative of sequentially selected ones of the plurality of magnetic field signals.
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Abstract
A magnetic field sensor includes a circular vertical Hall (CVH) sensing element comprising a plurality of vertical Hall elements, each one of the plurality of vertical hall elements comprising respective first and second current receiving contacts. The magnetic field sensor additionally includes a sequence switches circuit coupled to the plurality of vertical Hall elements. The magnetic field sensor also includes a first current source sequentially coupled by the sequence switches circuit to the first current receiving contact of sequentially selected ones of the plurality of vertical Hall elements. The magnetic field sensor further includes a second current source sequentially coupled by the sequence switches circuit to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements. The first and second current sources can swap couplings in half-period intervals for each of a plurality of coupling arrangements. A corresponding method is also described.
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Citations
20 Claims
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1. A magnetic field sensor, comprising:
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a circular vertical Hall (CVH) sensing element comprising; a plurality of vertical Hall elements, each one of the plurality of vertical hall elements comprising respective first and second current receiving contacts, respective first and second output signal generating contacts, and a respective at least one reference contact, wherein the at least one reference contact is positioned between the first and second current receiving contacts, the first output signal generating contact is positioned between the at least one reference contact and the first current receiving contact, and the second output signal generating contact is positioned between the at least one reference contact and the second current receiving contact;
wherein the plurality of vertical Hall elements is configured to generate a plurality of magnetic field signals, each magnetic field signal responsive to a magnetic field;
the magnetic field sensor further comprising;a sequence switches circuit coupled to the plurality of vertical Hall elements, wherein the sequences switches circuit is operable to sequentially select from among the plurality of vertical Hall elements to generate sequenced signal steps; a first current source sequentially coupled by the sequence switches circuit to the first current receiving contact of sequentially selected ones of the plurality of vertical Hall elements, and operable to provide, at first sequential times, a first current signal to the first current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements; a second current source sequentially coupled by the sequence switches circuit to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements and operable to provide, at the same first sequential times, a second current signal to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements; and an amplifier circuit coupled to receive the sequenced signal steps produced at the first and second output signal generating contacts of the sequentially selected ones of the plurality of vertical Hall elements, and, in response to the sequenced signal steps, the amplifier circuit is configured to generate an amplified signal representative of sequentially selected ones of the plurality of magnetic field signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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generating a plurality of magnetic field signals with a circular vertical Hall (CVH) sensing element, the CVH sensing element comprising a plurality of vertical Hall elements, each one of the plurality of vertical hall elements comprising respective first and second current receiving contacts, respective first and second output signal generating contacts, and a respective at least one reference contact, wherein the at least one reference contact is positioned between the first and second current receiving contacts, the first output signal generating contact is positioned between the at least one reference contact and the first current receiving contact, and the second output signal generating contact is positioned between the at least one reference contact and the second current receiving contact, each magnetic field signal being responsive to a magnetic field; sequentially selecting from among the plurality of vertical Hall elements; generating a first current signal and providing, at first sequential times, the first current signal to the first current receiving contact of sequentially selected ones of the plurality of vertical Hall elements; generating a second current signal and providing, at the same first sequential times, the second current signal to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements; generating a first sequenced signal step, responsive to an external magnetic field, at the first and second output generating contacts of the sequentially selected ones of the plurality of vertical Hall elements; and generating an amplified signal representative of sequentially selected ones of the plurality of magnetic field signals in response to at least the first sequenced signal step. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A magnetic field sensor, comprising:
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a circular vertical Hall (CVH) sensing element comprising; a plurality of vertical Hall elements, each one of the plurality of vertical hall elements comprising respective first and second current receiving contacts, respective first and second output signal generating contacts, and a respective at least one reference contact, wherein the at least one reference contact is positioned between the first and second current receiving contacts, the first output signal generating contact is positioned between the at least one reference contact and the first current receiving contact, and the second output signal generating contact is positioned between the at least one reference contact and the second current receiving contact;
wherein the plurality of vertical Hall elements is configured to generate a plurality of magnetic field signals, each magnetic field signal responsive to a magnetic field;
the magnetic field sensor further comprising;means for sequentially selecting from among the plurality of vertical Hall elements to generate sequenced signal steps; means for providing, at first sequential times, a first current signal to the first current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements; means for providing, at the same first sequential times, a second current signal to the second current receiving contact of the sequentially selected ones of the plurality of vertical Hall elements; and means for generating an amplified signal representative of sequentially selected ones of the plurality of magnetic field signals in response to receiving the sequenced signal steps produced at the first and second output signal generating contacts of the sequentially selected ones of the plurality of vertical Hall elements. - View Dependent Claims (19, 20)
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Specification