An electronic system comprising: - a piezoresistive sensor biased (BIAS_P, BIAS_N) with a supply voltage, said piezoresistive sensor being coupled to a resonating micro-mirror and configured to sense a motion of said resonating micro-mirror and to generate a sensor analog signal ( V S) at a first frequency ( f S), - a sensing circuit coupled to said piezoresistive sensor for sensing the sensor analog signal ( V S) and generating an output digital signal ( ADC_out') indicative of the sensor analog signal sensed ( V S), said sensor analog signal ( V S) having superimposed a periodic signal at a second frequency ( f H) higher than said first frequency ( f S), and - a signal generator circuit configured for generating said periodic signal at the second frequency ( f H), wherein the signal generator circuit is coupled to the conditioning circuit block in the sensing circuit and is configured to superimpose the periodic signal at the second frequency (fH) to the sensor analog signal (Vs) received at the conditioning circuit block, wherein the sensing circuit comprises: - a conditioning circuit block configured for receiving at an input port (PZR_P, PZR_N) the input analog signal ( V S) and generating at an output port (AFE_P, AFE_N) a conditioned analog signal ( V S,C), - an analog-to-digital converter coupled at the output port (AFE_P, AFE_N) of the conditioning circuit block, the analog-to-digital converter configured for receiving the conditioned analog signal ( V S,C) and providing at a converter output node a converted digital signal ( ADC_out) resulting from conversion to digital of the conditioned analog signal ( V S,C) and indicative of the input analog signal sensed ( V S), - a feedback circuit block between the converter output node of the analog-to-digital converter and a control input of the conditioning circuit block, the feedback circuit block comprising a band-pass filter configured to selectively detect said periodic signal at said second frequency ( f H), the feedback circuit block being configured to act on the conditioning circuit block to counter variations of the periodic signal at the second frequency ( f H), and - a low-pass filter coupled at the converter output node of the analog-to-digital converter and having a low-pass cut-off frequency lower than the second frequency ( f H), the low-pass filter configured to filter out the periodic signal from the converted digital signal ( ADC_out) to generate the output digital signal ( ADC_out'), wherein the feedback circuit block is configured to detect an amplitude of the periodic signal at the second frequency ( f H), and: i) as a result of said amplitude of the periodic signal increasing, acting on the conditioning circuit block in order to lower a cut-off frequency ( f 0) of the conditioning circuit block; and/or ii) as a result of said amplitude of the periodic signal decreasing, acting on the conditioning circuit block in order to increase a cut-off frequency ( f 0) of the conditioning circuit block. - a piezoresistive sensor biased (BIAS_P, BIAS_N) with a supply voltage, said piezoresistive sensor being coupled to a resonating micro-mirror and configured to sense a motion of said resonating micro-mirror and to generate a sensor analog signal ( V S) at a first frequency ( f S), - a sensing circuit coupled to said piezoresistive sensor for sensing the sensor analog signal ( V S) and generating an output digital signal ( ADC_out') indicative of the sensor analog signal sensed ( V S), said sensor analog signal ( V S) having superimposed a periodic signal at a second frequency ( f H) higher than said first frequency ( f S), and - a signal generator circuit configured for generating said periodic signal at the second frequency ( f H), - a conditioning circuit block configured for receiving at an input port (PZR_P, PZR_N) the input analog signal ( V S) and generating at an output port (AFE_P, AFE_N) a conditioned analog signal ( V S,C), - an analog-to-digital converter coupled at the output port (AFE_P, AFE_N) of the conditioning circuit block, the analog-to-digital converter configured for receiving the conditioned analog signal ( V S,C) and providing at a converter output node a converted digital signal ( ADC_out) resulting from conversion to digital of the conditioned analog signal ( V S,C) and indicative of the input analog signal sensed ( V S), - a feedback circuit block between the converter output node of the analog-to-digital converter and a control input of the conditioning circuit block, the feedback circuit block comprising a band-pass filter configured to selectively detect said periodic signal at said second frequency ( f H), the feedback circuit block being configured to act on the conditioning circuit block to counter variations of the periodic signal at the second frequency ( f H), and - a low-pass filter coupled at the converter output node of the analog-to-digital converter and having a low-pass cut-off frequency lower than the second frequency ( f H), the low-pass filter configured to filter out the periodic signal from the converted digital signal ( ADC_out) to generate the output digital signal ( ADC_out'), i) as a result of said amplitude of the periodic signal increasing, acting on the conditioning circuit block in order to lower a cut-off frequency ( f 0) of the conditioning circuit block; and/or ii) as a result of said amplitude of the periodic signal decreasing, acting on the conditioning circuit block in order to increase a cut-off frequency ( f 0) of the conditioning circuit block.