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US 2011/0298448 A1Published application
Motion Sensor, Method, and Computer-Readable Storage Medium Providing a Motion Sensor That Can Rapidly Calibrate Gains
AssigneeAllegro MicroSystems, LLC
InventorsAndrea Foletto, Devon Fernandez, Eric Burdett
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Abstract
A motion sensor has a channel amplitude difference processor configured to adjust gains of two channels to bring a gain of a one channel toward a gain of the other channel when a gain mismatch is detected.
Claims24
A motion sensor, comprising:
- a plurality of magnetic field sensing elements configured to generate a plurality of magnetic field signals indicative of a magnetic field associated with an object;
- a plurality of AGC circuits coupled to receive a respective plurality of signals representative of the plurality of magnetic field signals and configured to generate a respective plurality of gain-adjusted output signals;
- an AGC processor configured to generate a plurality of AGC control signals to control respective gains of the plurality of AGC circuits;
- and
- a channel amplitude difference processor coupled to receive a first signal representative of a first one of the plurality of AGC control signals and a second signal representative of a second one of the plurality of AGC control signals, wherein the channel amplitude difference processor is configured to detect if a value of the first signal is representative of a different gain than a value of the second signal by a predetermined amount, and configured to generate an AMP_DIFF_FLAG signal indicative of the different gain in response to the detection, wherein, in response to the AMP_DIFF_FLAG signal, the AGC processor is configured to change the value of the first one of the plurality of AGC control signals to bring its value closer to the value of the second one of the AGC control signals.
2 more elements
A method of detecting a motion of an object, comprising:
- generating a plurality of magnetic field signals indicative of a magnetic field associated with the object;
- generating a plurality of gain-adjusted signals representative of the plurality of magnetic field signals;
- generating a plurality of AGC control signals to control respective gains of the plurality of gain-adjusted output signals;
- detecting if a value of a first one of the plurality of AGC control signals is representative of a higher gain than a value of a second one of the plurality of AGC control signals by a predetermined amount;
- and
- in response to the detecting, changing the value of the first one of the plurality of AGC control signals to bring its value closer to the value of the second one of the AGC control signals.
3 more elements
A computer-readable storage medium having computer readable code thereon for providing sensing of a motion of an object, the medium comprising:
- instructions for receiving a plurality of magnetic field signals indicative of a magnetic field associated with the object;
- instructions for generating a plurality of gain-adjusted signals representative of the plurality of magnetic field signals;
- instructions for generating a plurality of AGC control signals to control respective gains of the plurality of gain-adjusted output signals;
- instructions for detecting if a value of a first one of the plurality of AGC control signals is representative of a higher gain than a value of a second one of the plurality of AGC control signals by a predetermined amount;
- and
- instructions for, in response to the detecting, changing the value of the first one of the plurality of AGC control signals to bring its value closer to the value of the second one of the AGC control signals.
3 more elements
Dependencies are inferred from the claim text.