Method for measuring a physical parameter and electronic circuit to interface with a capacitive sensor for implementing same

摘要

The method involves starting conversion with a series of successive measuring cycles, in which digital signals are adapted in a logic unit (5) of electronic interface circuit (1) to each cycle by adding/subtracting a determined step value greater than 2 based on data supplied by a comparator type charge transfer amplifier (4). Each conversion is started with another series of successive measuring cycles after the former series of measuring cycles, in which the signals are adapted to each cycle by adding/subtracting another determined step value equal to 1 or 2 until end of conversion. An independent claim is also included for an electronic interface circuit for a capacitive sensor.