Capacitive sensor with temperature drift mitigation
US12123753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2022 |
| Grant date | Oct 22, 2024 |
| Priority date | — |
| Expiry date | Dec 29, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for mitigating background capacitance and for mitigating the effect of temperature drift in compensation circuitry is provided. The system includes a plurality of sensor electrodes including a first sensor electrode and a second sensor electrode. The first sensor electrode is coupled to a first channel and the second sensor electrode is coupled to a second channel. The system includes a processing system configured to drive the plurality of sensor electrodes with a sensing signal; drive the first channel with a first compensation signal and the second channel with a second compensation signal; determine a first differential capacitance between the first channel and the second channel; drive the first channel with the second compensation signal and the second channel with the first compensation signal; determine a second differential capacitance between the first channel and the second channel; and mitigate temperature drift using the first differential capacitance and the second differential capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.