Chopping scheme for magnetic field sensor having shared ADC
AssigneeAllegro MicroSystems, LLC
InventorAhmed Hassan Fahmy
Life of this patent
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Abstract
Methods and apparatus for magnetic field sensor having a sample chopping with a shared ADC. A sensor may include receiving a chopping sequence for samples from first and second channels that share an analog-to-digital converter (ADC) in a magnetic field sensor. The samples for the first and second channel are timed with respect to a virtual sampling time (VST), such that a sum of the sample times for the samples for the first channel is equal to the VST, and a sum of the sample times for the samples for the second channel is equal to VST.
Claims23
A method, comprising:
- receiving a chopping sequence for samples from first and second channels that share an analog-to-digital converter (ADC) in a magnetic field sensor,
- wherein the samples for the first and second channel are arranged in time with respect to a virtual sampling time (VST) at each frame of samples, wherein an average of sample times of samples of a given one of the first and second channels in one frame aligns with the virtual sample time (VST) of the respective time frame.
The method according to 11, wherein the first magnetic field sensing element comprises a Hall element.
A magnetic field sensor, comprising:
- an analog-to-digital converter (ADC) configured to receive a chopping sequence for samples from first and second channels that share the ADC;
- wherein the samples for the first and second channel are arranged in time with respect to a virtual sampling time (VST) at each frame of samples, wherein an average of sample times of samples of a given one of the first and second channels in one frame aligns with the virtual sample time (VST) of the respective time frame.
The method according to 22, wherein the first magnetic field sensing element comprises a Hall element.
Dependencies are inferred from the claim text.