Capacitance detecting circuit, touch device and terminal device
US10845926B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2019 |
| Grant date | Nov 24, 2020 |
| Priority date | — |
| Expiry date | May 22, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/962
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present application discloses a capacitance detecting circuit, a touch device and terminal device, which are beneficial for reducing an area of the capacitance detecting circuit, thereby reducing costs of a chip. The capacitance detecting circuit is connected to a measurement capacitor and where it includes a calibration capacitor; a charging and discharging module including a first current source configured to perform charging or discharging on the measurement capacitor, and a second current source configured to perform charging or discharging on the calibration capacitor; an integrator, configured to convert a capacitance signal of the measurement capacitor into a voltage signal; and a control module, configured to control working states of the charging and discharging module and the integrator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.