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US 2020/0225636 A1Published application
Methods and apparatus for an encoder
AssigneeSemiconductor Components Industries, LLC
InventorsSreenivasa Murthy NERAYANURU, Jeffrey Dennis Allgood
Life of this patent
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Abstract
Various embodiments of the present technology comprise a method and apparatus for an encoder. In various embodiments, the encoder is configured to perform offset and gain correction. The encoder includes a first correction circuit to perform offset and gain correction and a second correction circuit to perform additional offset and gain correction.
Claims20
An encoder capable of receiving first channel data and second channel data, comprising:
- a first circuit comprising:
- a plurality of variable gain amplifiers configured to:
- apply a first gain to the first channel data and the second channel data;
- and
- apply a first DC offset correction to the first channel data and the second channel data;
- and
- a second circuit connected to an output terminal of the first circuit, and comprising:
- an offset correction circuit configured to:
- apply a second DC offset correction to the first channel data and the second channel data;
- and
- generate:
- first corrected data based on the first channel data;
- and
- second corrected data based on the second channel data;
- and
- a gain correction circuit coupled to the offset correction circuit, and configured to apply a second gain to the first corrected data and the second corrected data according to a predetermined ideal signal.
13 more elements
A method for gain and offset correction of first channel data and second channel data, comprising:
- applying a fixed gain to the first channel data and the second channel data;
- applying a first DC offset correction to the first channel data and the second channel data;
- converting the first channel data to a first digital signal and converting the second channel data to a second digital signal;
- apply a second DC offset correction to the first and second digital signals;
- generating corrected first and second digital signals;
- and
- applying a second gain to the corrected first and second digital signals according to a predetermined ideal signal.
4 more elements
A system comprising:
- a motor assembly connected to a drive circuit, wherein the motor assembly comprises:
- a motor capable of generating first channel data and second channel data;
- and
- an encoder positioned adjacent to the motor and configured to monitor the motor;
- wherein the encoder comprises:
- a first correction circuit configured to:
- apply a fixed gain to the first channel data and the second channel data;
- and
- apply a first DC offset correction to the first channel data and the second channel data;
- generate a first comparator signal according to the first channel data;
- and
- generate a second comparator signal according to the second channel data;
- a signal conversion circuit connected to the first correction circuit and configured to convert the first channel data into a first digital signal and the second channel data into a second digital signal;
- a second correction circuit connected in series with the signal conversion circuit and configured to:
- apply a second DC offset correction to the first and second digital signals;
- and
- generate corrected first and second digital signals;
- and
- apply a second gain to the corrected first and second digital signals according to a predetermined ideal signal;
- and
- a signal processing circuit connected to the second correction circuit and configured to compute a phase of the motor according to the first comparator signal, the second comparator signal, and the corrected first and second digital signals.
18 more elements
Dependencies are inferred from the claim text.