Interference mitigation and clock dithering for a continuous-time receiver for capacitive sensing
US10175824B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2017 |
| Grant date | Jan 8, 2019 |
| Priority date | — |
| Expiry date | Jul 6, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Embodiments herein describe input devices that include receivers for sampling capacitive sensing signals that perform continuous-time demodulation. An input device is provided that includes a plurality of sensor electrodes in a sensing region of the input device and a processing system coupled to the plurality of sensor electrodes and configured to generate a first measurement of a capacitive sensing signal acquired using a first sensor electrode of the plurality of sensor electrodes during a first time period, that comprises effects of a first modulated signal driven onto at least one of the plurality of sensor electrodes, the first measurement generated at a first sensing frequency based on a clock signal; periodically dither the clock signal; and adjust a demodulation frequency based on the dithered clock signal to generate a second measurement of the capacitive sensing signal during a second time period at the first sensing frequency based on the dithered clock signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.