Device, system and method for analogue-to-digital conversion using a current integrating circuit

摘要

The invention relates to a device (1') for converting an input analogue current signal (lin) into an output digital signal (Out), comprising: a sample and hold circuit (3) for providing at least one signal related to the input analogue current signal (lin); an analogue-to digital conversion and control circuit (4) for performing an analogue-to-digital conversion of the at least one related signal at the output of the sample and hold module (3) into said output digital signal (Out); and wherein the sample and hold circuit (3) is adapted for sampling the analogue current signal (lin) and integrating it on capacitive means (C) which are configurable to dynamically changing its effective capacitance value (CVA, CVB, CVB2, CVB3) in order to shape a voltage signal (Vs) present on said capacitive means (C); and the analogue-to-digital conversion and control circuit (4) comprises successive approximation analogue-to-digital conversion means for considering the value of the voltage signal (Vs) on the capacitive means and converting a charge value (Q) present in said variable capacitive means into the digital output signal (Out). The invention also relates to a system (1) for converting an input analogue voltage signal (Vin) into an output digital signal (Out), a method for converting an analogue current signal (lin) into a digital signal (Out), and a method for converting an analogue voltage signal (Vin) into a digital signal (Out).