Device and method for reading a capacitive sensor, in particular of a micro-electromechanical type
US7595648B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2006 |
| Grant date | Sep 29, 2009 |
| Priority date | — |
| Expiry date | Sep 26, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P15/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A read device of a capacitive sensor includes: a signal source supplying an electrical read signal for driving the capacitive sensor; and a discrete-time sense circuit for generating an electrical output signal, correlated to variations of capacitance of the capacitive sensor, in response to variations of the electrical read signal. The device moreover includes: a modulator stage for generating a modulated electrical read signal on the basis of the electrical read signal and supplying the modulated electrical read signal to the capacitive sensor; a demodulator stage, connected to the sense circuit, for demodulating the electrical output signal and generating a demodulated electrical output signal; and a low-pass filtering stage for generating a filtered electrical output signal, on the basis of the modulated electrical output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.