Hall sensors having forced sensing nodes
First Claim
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1. A method comprising:
- applying a bias signal to a first node of a Hall plate;
forcing a voltage level at second and third nodes of the Hall plate to a fixed value;
measuring a differential signal in each of first and second feedback circuits coupled, respectively, to the second and third nodes; and
determining a magnetic field output signal from the differential signals.
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Abstract
Embodiments relate to forced spinning Hall sensors. In embodiments, forced Hall sensors can provide reduced residual offset, lower current consumption and improved or complete rejection of nonlinear backbias effects when compared with conventional approaches.
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Citations
22 Claims
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1. A method comprising:
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applying a bias signal to a first node of a Hall plate; forcing a voltage level at second and third nodes of the Hall plate to a fixed value; measuring a differential signal in each of first and second feedback circuits coupled, respectively, to the second and third nodes; and determining a magnetic field output signal from the differential signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A Hall sensor comprising:
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a Hall plate; a bias source coupled to a first node of the Hall plate; a feedback circuit coupled to a second node and a third node of the Hall plate; a voltage source coupled to the feedback circuit; a first current source coupled to the feedback circuit and selectively coupleable to one or the other of the second and third nodes and configured to inject a common mode current at the second or third node; a second current source coupled to the feedback circuit and selectively coupleable to one or the other of the third and second nodes and configured to inject a common mode current at the third or second node; circuitry selectively coupleable to the second and third nodes; and an output signal related to a differential signal at an output of the feedback circuit and an output of the circuitry. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification