Abstract: 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.

Abstract: The invention relates to a capacitive proximity device (30, 40, 50, 60) for sensing a presence and/or absence of an object (32) in the proximity of an electronic device (34). The capacitive proximity device (30, 40, 50, 60) comprises: an emission electrode (TA) capacitively coupled to a receiver electrode ( ), an oscillator (17) for generating an emission-signal (ES) being an alternating electric field ( ) between the emission electrode (TA) and the receiving electrode ( ), and a sensing circuit (70, 72, 74, 76, 78) connected to the receiving electrode ( ). The sensing circuit receives a measured-signal (MS) from the receiver electrode ( ), and comprising a first synchronous detection circuit ( ) together with a low-pass filter (14) for generating an output-signal (OS) being proportional to a distance between the object and the electronic device.