Electronic circuit with a capacitive sensor for measuring a physical parameter, and method for activating the electronic circuit

摘要

The circuit (1) has an integrator unit (5) for integrating charges supplied by a charge transfer amplifier unit and for supplying output voltage (Vm). An excitation unit (3) is arranged between an output of the integrator unit and a capacitive sensor (2). A circuit interface includes a dynamic comparator (30) for comparing the output voltage with comparison voltage (Vc) to control disconnection of a compensation capacitor (Cc) at an input of the integrator unit when deviation between the output voltage and the comparison voltage is above a determined voltage threshold. An independent claim is also included for a method for activating an electronic circuit.