A sensor circuit (120; 520; 620; 720) for measuring a physical quantity, the sensor circuit comprising: - a signal acquisition circuit (140; 540; 640; 740) comprising at least one sensor (121, 122; 521, 522, 523; 621, 622; 721, 722, 723) configured to provide at least one input signal (v1, v2) related to the physical quantity; - a processing circuit (150; 350; 350'; 450; 550; 650; 750) configured to receive said at least one input signal (v1, v2) and for providing an output signal (θcorr) representative of the physical quantity; the processing circuit (150; 350; 350'; 450; 550; 650; 750) comprising a closed loop, comprising: i) a first sub-circuit (360; 360'; 460; 660; 760) arranged for receiving said at least one input signal (v1, v2) and at least one feedback signal (fbi, fbq; θfb1; θfb2), and comprising a combiner (331; 331'; 431; 631; 731), and configured for providing a first signal (θest, θcalc); ii) a frequency dependent filter (332; 332'; 432; 632; 732) configured for receiving and filtering said first signal (θest, θcalc), and for providing a filtered signal or a signal derived therefrom as the output signal (θcorr); and iii) a second sub-circuit (333; 333'; 433; 670; 770) configured for receiving said filtered signal (θcorr), and for converting said filtered signal (θcorr) into said at least one feedback signal (fbi, fbq; θfb1; θfb2) using a non-linear function; characterised in that the non-linear function is a piecewise-linear approximation function defined by a plurality of parameters determined during a calibration procedure. - a signal acquisition circuit (140; 540; 640; 740) comprising at least one sensor (121, 122; 521, 522, 523; 621, 622; 721, 722, 723) configured to provide at least one input signal (v1, v2) related to the physical quantity; - a processing circuit (150; 350; 350'; 450; 550; 650; 750) configured to receive said at least one input signal (v1, v2) and for providing an output signal (θcorr) representative of the physical quantity; the processing circuit (150; 350; 350'; 450; 550; 650; 750) comprising a closed loop, comprising: i) a first sub-circuit (360; 360'; 460; 660; 760) arranged for receiving said at least one input signal (v1, v2) and at least one feedback signal (fbi, fbq; θfb1; θfb2), and comprising a combiner (331; 331'; 431; 631; 731), and configured for providing a first signal (θest, θcalc); ii) a frequency dependent filter (332; 332'; 432; 632; 732) configured for receiving and filtering said first signal (θest, θcalc), and for providing a filtered signal or a signal derived therefrom as the output signal (θcorr); and iii) a second sub-circuit (333; 333'; 433; 670; 770) configured for receiving said filtered signal (θcorr), and for converting said filtered signal (θcorr) into said at least one feedback signal (fbi, fbq; θfb1; θfb2) using a non-linear function; i) a first sub-circuit (360; 360'; 460; 660; 760) arranged for receiving said at least one input signal (v1, v2) and at least one feedback signal (fbi, fbq; θfb1; θfb2), and comprising a combiner (331; 331'; 431; 631; 731), and configured for providing a first signal (θest, θcalc); ii) a frequency dependent filter (332; 332'; 432; 632; 732) configured for receiving and filtering said first signal (θest, θcalc), and for providing a filtered signal or a signal derived therefrom as the output signal (θcorr); and iii) a second sub-circuit (333; 333'; 433; 670; 770) configured for receiving said filtered signal (θcorr), and for converting said filtered signal (θcorr) into said at least one feedback signal (fbi, fbq; θfb1; θfb2) using a non-linear function; <EOS>