Patent ID: 8497746

Claim:
A switched-capacitor bandpass filter, comprising: a first input configured to receive a time-discrete signal formed by a first component and by an undesired component; a first output; an operational amplifier having a first input and a first output, the first output of the operational amplifier being coupled to the first output of the filter; a first input branch including: an input node; a filtering capacitive element having a first terminal coupled to the first input of the operational amplifier and a second terminal; a coupling switch coupled between the input node and the second terminal of the filtering capacitive element; an input sampling capacitive element coupled between the first input of the filter and the input node; and an input sampling switch coupled between the input node and a reference potential line, the coupling switch and the input sampling switch being configured so as to close in counterphase according to a sequence of undesired component sampling steps and sensing steps, so that the input sampling capacitive element forms a sampler of the undesired components in the undesired component sampling steps, in absence of the first component, and forms a subtractor of the undesired component from the time-discrete signal in the sensing step.