Apparatus for controlling lens module and reducing offset of Hall sensor
US11977240B2 · kind B2 · utility
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1References
17Claims
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Assignee
Inventors
Key dates
| Filing date | Feb 3, 2021 |
| Grant date | May 7, 2024 |
| Priority date | — |
| Expiry date | Dec 20, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45528
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus configured to reduce an offset of a Hall sensor includes a voltage-current conversion circuit and a current mirror circuit. The voltage-current conversion circuit is configured to generate a current configured to decrease when a voltage of an input terminal to which a bias current of a Hall sensor is input increases and increase when the voltage of the input terminal decreases. The current mirror circuit has a current mirror structure configured to feedback the bias current based on the current generated by the voltage-current conversion circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.