Capacitance detection circuit, semiconductor device, input device and electronic apparatus including the same, and method of detecting capacitance
US11092633B2 · kind B2 · utility
1Cited by
12References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 14, 2019 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Feb 14, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45528
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitance detection circuit for measuring an electrostatic capacitance, includes: a control signal generator configured to generate a control signal; a drive circuit having a push-pull type output stage and configured to apply a drive voltage to the electrostatic capacitance according to the control signal; a current detection circuit configured to generate a detection current which is a replica of a current flowing through the output stage of the drive circuit; and an integrating circuit configured to integrate the detection current to generate a detection voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.