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US 7,911,203 B2Granted
Sensor having an analog processing module to generate a linear position output
AssigneeAllegro MicroSystems, LLC
InventorsMonica J. Thomas, Michael C. Doogue, Hooman Bustani
Life of this patent
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Abstract
A sensor having a signal generation module including a first magnetic sensor, an analog signal processing module, and a signal inversion module for inverting a first waveform and a second waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet.
Claims31
A sensor, comprising:
- a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors;
- an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal;
- and
- a signal inversion module coupled to the signal generation module for inverting the first waveform to provide a first inverted waveform and for inverting the second waveform to provide a second inverted waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet,
- wherein the first region corresponds to −sin(θ)>cos(θ) where −sin(θ) refers to the inversion of the sine wave about an offset voltage, sin(θ) and cos(θ) embody the amplitudes and offsets associated with the sinusoids, and θ indicates an angle of a rotating magnet in the magnetic sensor, and wherein the second region corresponds to a position range in which output would be non-linear without inversion of the first and second waveforms.
2 more elements
A sensor, comprising:
- a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors;
- an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal;
- and
- a signal inversion module coupled to the signal generation module for inverting the first waveform to provide a first inverted waveform and for inverting the second waveform to provide a second inverted waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet,
- wherein the first region corresponds to −sin(θ)>cos(θ) where −sin(θ) refers to the inversion of the sine wave about an offset voltage, sin(θ) and cos(θ) embody the amplitudes and offsets associated with the sinusoids, and θ indicates an angle of a rotating magnet in the magnetic sensor, and wherein the sensor is provided on a single substrate.
2 more elements
Dependencies are inferred from the claim text.