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

摘要

A device including a sample and hold circuit for providing a signal related to an input analogue current signal, by sampling the input analogue current signal and integrating it on capacitive means, thereby charging the capacitive means to a charge value. The capacitive means being configurable to dynamically change its effective capacitance value in order to shape a voltage signal present on the capacitive means such that the charge value remains unchanged. The device also including an analogue-to digital conversion (ADC) and control circuit arranged for performing an ADC of the at least one related signal at the output of the sample and hold circuit into an output digital signal, the ADC and control circuit including successive approximation ADC means for considering the value of the voltage signal on the capacitive means and converting the charge value present in the capacitive means into the digital output signal.

主权项

1. A device comprising:
a sample and hold circuit configured to provide at least one signal related to an input analogue current signal by sampling the input analogue current signal and integrating it on capacitive means, thereby charging the capacitive means to a charge value, wherein the capacitive means is configured to dynamically change its effective capacitance value in order to shape a voltage signal present on the capacitive means by biasing the capacitive means, while the charge value on the capacitive means remains unchanged; and an analogue-to digital conversion and control circuit configured to perform an analogue-to-digital conversion of the at least one related signal provided by the sample and hold circuit into an output digital signal, the analogue-to-digital conversion and control circuit including successive approximation analogue-to-digital conversion means for considering a value of the voltage signal on the capacitive means and converting the charge value present in the capacitive means into the digital output signal.