CAPACITIVE PROXIMITY DEVICE AND ELECTRONIC DEVICE COMPRISING THE CAPACITIVE PROXIMITY DEVICE

CAPACITIVE PROXIMITY DEVICE AND ELECTRONIC DEVICE COMPRISING THE CAPACITIVE PROXIMITY DEVICE

A capacitive proximity device for sensing a presence and/or absence of an object in the proximity of an electronic device includes an emission electrode capacitively coupled to a receiver electrode, an oscillator for generating an emission-signal being an alternating electric field between the emiss...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ASJES, RONALD, J, VERSPAGET, HENRICUS, A, PRESURA, CRISTIAN, N, ROMMERS, ADRIANUS, P., J., M, BLOM, ANTONIUS, H., M
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
PULSE TECHNIQUE
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Beschreibung
Zusammenfassung:A capacitive proximity device for sensing a presence and/or absence of an object in the proximity of an electronic device includes an emission electrode capacitively coupled to a receiver electrode, an oscillator for generating an emission-signal being an alternating electric field between the emission electrode and the receiving electrode, and a sensing circuit connected to the receiving electrode. The sensing circuit receives a measured-signal from the receiver electrode and includes a first synchronous detection circuit together with a low-pass filter for generating an output-signal being proportional to a distance between the object and the electronic device. The sensing circuit further includes a noise-suppresser for reducing noise from the measured-signal before entering the first synchronous detection circuit.