An apparatus comprising: at least one magnetic field sensing circuit configured to generate a measured signal representing a magnetic field during a measured time period and to generate a reference signal representing a reference magnetic field during a reference time period; and at least one multi-path analog-to-digital converter (222; 422) comprising: an input; an output; and at least one multi-path integrator circuit to integrate the measured signal during the measured time period and integrate the reference signal during the reference time period, the multi-path integrator circuit comprising: a first processing circuit selectively coupled between the input and the output during the measured time period to process the measured signal and decoupled from the input and the output during the reference time period; and a second processing circuit selectively coupled between the input and the output during the reference time period to process the reference signal and decoupled from the input and the output during the measured time period; and at least one shared signal processing circuit configured to process both the measured signal and the reference signal. at least one magnetic field sensing circuit configured to generate a measured signal representing a magnetic field during a measured time period and to generate a reference signal representing a reference magnetic field during a reference time period; and at least one multi-path analog-to-digital converter (222; 422) comprising: an input; an output; and at least one multi-path integrator circuit to integrate the measured signal during the measured time period and integrate the reference signal during the reference time period, the multi-path integrator circuit comprising: a first processing circuit selectively coupled between the input and the output during the measured time period to process the measured signal and decoupled from the input and the output during the reference time period; and a second processing circuit selectively coupled between the input and the output during the reference time period to process the reference signal and decoupled from the input and the output during the measured time period; and at least one shared signal processing circuit configured to process both the measured signal and the reference signal. an input; an output; and at least one multi-path integrator circuit to integrate the measured signal during the measured time period and integrate the reference signal during the reference time period, the multi-path integrator circuit comprising: a first processing circuit selectively coupled between the input and the output during the measured time period to process the measured signal and decoupled from the input and the output during the reference time period; and a second processing circuit selectively coupled between the input and the output during the reference time period to process the reference signal and decoupled from the input and the output during the measured time period; and at least one shared signal processing circuit configured to process both the measured signal and the reference signal. a first processing circuit selectively coupled between the input and the output during the measured time period to process the measured signal and decoupled from the input and the output during the reference time period; and a second processing circuit selectively coupled between the input and the output during the reference time period to process the reference signal and decoupled from the input and the output during the measured time period; and at least one shared signal processing circuit configured to process both the measured signal and the reference signal.