Noise measurement in capacitive touch sensors
US8629686B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2013 |
| Grant date | Jan 14, 2014 |
| Priority date | — |
| Expiry date | Jul 18, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0443
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In particular embodiments, an apparatus includes a charge-measurement capacitor having a first plate coupled to a second plate of a coupling capacitor and a non-transitory computer-readable storage medium embodying logic that is operable when executed to ground a first plate of the coupling capacitor; inject a pre-determined amount of charge onto the charge-measurement capacitor; and transfer an amount of charge accumulated on the second plate of the coupling capacitor to the first plate of the charge-measurement capacitor. The charge accumulated on the second plate of the coupling capacitor is due at least in part to noise. The logic is also operable when executed to determine, through a measured voltage across the charge-measurement capacitor, the amount of charge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.