Capacitance voltage conversion circuit, input apparatus using the same, electronic instrument, and capacitance voltage conversion method
US9261545B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2012 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | Dec 19, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/962
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitance voltage conversion circuit, which converts respective capacitances of a plurality of sensor capacitors into voltages, includes: a plurality of capacitance current conversion circuits disposed in respective correspondence with the sensor capacitors, each capacitance current conversion circuit configured to generate a detection current corresponding to a capacitance of a corresponding sensor capacitor; a current average circuit configured to average a plurality of detection currents, which are respectively generated by the capacitance current conversion circuits, to generate an average current; and a plurality of current voltage conversion circuits disposed in respective correspondence with the sensor capacitors, each current voltage conversion circuit configured to convert a difference current between a corresponding detection current and the average current into a voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.