Capacitance-to-voltage modulation circuit
US10353511B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2016 |
| Grant date | Jul 16, 2019 |
| Priority date | — |
| Expiry date | Dec 28, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960745
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure describes aspects of a capacitance-to-voltage modulation circuit. In some aspects, the circuit is used in touch sensing. In some aspects, a modulation circuit comprises a first pair of switches having one switch connected between a voltage source and a capacitor, and another switch connected between ground and the input of the circuit. The circuit also includes a second pair of switches having one switch connected between the voltage source and the input of the circuit, and another switch connected between ground and the capacitor. A third pair of the circuit's switches comprise one switch connected between the capacitor and an input of an analog-to-digital converter (ADC) and another switch connected between the input of the circuit and the input of the ADC. The third pair of switches may enable charge sharing of signals modulated by the first and second pairs of switches, a result of which can be used to sense touch input based on capacitance at the input of the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.