Oscillator-based sensor interface circuit arranged for online tuning of an error, comprising - at least two oscillators (21,22), at least one of which is arranged for receiving an electrical signal representative of an electrical quantity, said electrical quantity being a converted physical quantity and impacting said at least one oscillator's frequency, - chopping circuitry (50,51) arranged for modulating said electrical signal representative of said electrical quantity with a chopping signal and for feeding each of said at least two oscillators with an input signal, whereby at least one of said oscillators receives said modulated electrical signal, - phase detection means arranged to compare output signals of said at least two oscillators and for outputting a digital phase detection output signal in accordance with the outcome of said comparing, said phase detector output signal also being an output signal of said oscillator-based sensor interface circuit, whereby said chopping circuitry (50,51) is further arranged for demodulating said output signals before applying said output signals to said phase detection means or for demodulating said digital phase detection output signal, said oscillator-based sensor interface circuit further comprising - a feedback element arranged for receiving a representation of said digital phase detection output signal and for converting said representation into a feedback signal used directly or indirectly to maintain a given relation between oscillator frequencies of said at least two oscillators characterized by: - means for detecting a mismatch between the at least two oscillators by calculating a difference in the digital phase detection output signal between the chopping phases, - at least one tuning element arranged for receiving said calculated difference and for tuning at least one characteristic of the oscillator-based sensor interface circuit causing a change in oscillator frequency of at least one of said oscillators to reduce said detected mismatch. - at least two oscillators (21,22), at least one of which is arranged for receiving an electrical signal representative of an electrical quantity, said electrical quantity being a converted physical quantity and impacting said at least one oscillator's frequency, - chopping circuitry (50,51) arranged for modulating said electrical signal representative of said electrical quantity with a chopping signal and for feeding each of said at least two oscillators with an input signal, whereby at least one of said oscillators receives said modulated electrical signal, - phase detection means arranged to compare output signals of said at least two oscillators and for outputting a digital phase detection output signal in accordance with the outcome of said comparing, said phase detector output signal also being an output signal of said oscillator-based sensor interface circuit, - a feedback element arranged for receiving a representation of said digital phase detection output signal and for converting said representation into a feedback signal used directly or indirectly to maintain a given relation between oscillator frequencies of said at least two oscillators characterized by: - means for detecting a mismatch between the at least two oscillators by calculating a difference in the digital phase detection output signal between the chopping phases, - at least one tuning element arranged for receiving said calculated difference and for tuning at least one characteristic of the oscillator-based sensor interface circuit causing a change in oscillator frequency of at least one of said oscillators to reduce said detected mismatch.