Capacitance detection circuit and input device
US11567603B2 · kind B2 · utility
1Cited by
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14Claims
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Key dates
| Filing date | Mar 24, 2021 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | Mar 24, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitance detection circuit that is capable of reducing the influence of an environmental variation such as temperature. The capacitance detection circuit detects an electrostatic capacitance of a sensor electrode. A sense pin is connected to the sensor electrode. An analog front end circuit converts the electrostatic capacitance of the sensor electrode to an electrical signal, wherein an input-output characteristic of the analog front end circuit is variable. A controller adjusts the input-output characteristic of the analog front end circuit according to the environmental variation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.