Capacitance detection circuit, touch detection apparatus and electronic device
US11481072B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2020 |
| Grant date | Oct 25, 2022 |
| Priority date | — |
| Expiry date | Feb 24, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/96071
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is a capacitance detection circuit, which has better detection performance. The capacitance detection circuit includes: a first charging and discharging circuit configured to perform charging or discharging on a capacitor to be detected; a second charging and discharging circuit configured to perform charging or discharging on a calibration capacitor; an analog-to-digital conversion circuit configured to continuously sample a voltage difference between the capacitor to be detected and the calibration capacitor in a charging or discharging process to obtain sampled data; and a digital processing circuit configured to detect a capacitance of the capacitor to be detected according to the sampled data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.