Baseline charge compensation
US9019220B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2012 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Jun 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A compensation circuit may include a current source configured to control an amplitude of a current pulse, a memory configured to store a plurality of duration values each corresponding to a set of one or more sensor electrodes of a plurality of sensor electrodes, and a pulse width controller configured to control a duration of the current pulse based on a first duration value of the plurality of duration values, and to apply the current pulse to a compensation node of a capacitance sensor during a measurement cycle for a first set of one or more sensor electrodes, where the first set of one or more sensor electrodes corresponds to the first duration value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.