An apparatus, comprising: a sensor configured to generate charge in proportion to a sensed quantity; a charge coupling circuit comprising a flying capacitor coupled to ground; an integrating circuit; a switching circuit configured to selectively couple during a first phase, Φ1, of a current operational cycle the charge coupling circuit to the sensor and configured to selectively couple during a second phase, Φ2, of the current operational cycle the charge coupling circuit to the integrating circuit for transferring at least a portion of the charge generated by the sensor to the charge coupling circuit and to the integrating circuit; a first charge feedback circuit configured to feed back charge to the sensor from one of a first plurality of reference voltages that includes both a positive reference voltage and a negative reference voltage; a second charge feedback circuit configured to feed back charge to the integrating circuit from one of a second plurality of reference voltages that includes both a positive reference voltage and a negative reference voltage, where the first and the second charge feedback circuit (140; 150) are configured to feedback charge during the second phase, Φ2, of the current operational cycle; the integrating circuit being configured to accumulate charge in proportion to a difference between the charge transferred from the sensor to the integrating circuit by the switching circuit and the charge fed back to the integrating circuit by the second charge feedback circuit; an analog comparing circuit configured to detect accumulated charge at the integrating circuit for a current cycle to determine a polarity of charge feedback for a subsequent cycle, wherein an output of the analog comparing circuit is an analog signal that is one of two voltages based on the polarity of the accumulated charge; and a logic circuit configured to input the analog signal that is the output of the analog comparing circuit and to output a digital output corresponding to the sensed quantity and to provide the polarity of charge feedback determined by the analog comparing circuit to the first charge feedback circuit for controlling the charge fed back to the sensor and also to the second charge feedback circuit for controlling the charge fed back to the integrating circuit. a sensor configured to generate charge in proportion to a sensed quantity; a charge coupling circuit comprising a flying capacitor coupled to ground; an integrating circuit; a switching circuit configured to selectively couple during a first phase, Φ1, of a current operational cycle the charge coupling circuit to the sensor and configured to selectively couple during a second phase, Φ2, of the current operational cycle the charge coupling circuit to the integrating circuit for transferring at least a portion of the charge generated by the sensor to the charge coupling circuit and to the integrating circuit; a first charge feedback circuit configured to feed back charge to the sensor from one of a first plurality of reference voltages that includes both a positive reference voltage and a negative reference voltage; a second charge feedback circuit configured to feed back charge to the integrating circuit from one of a second plurality of reference voltages that includes both a positive reference voltage and a negative reference voltage, where the first and the second charge feedback circuit (140; 150) are configured to feedback charge during the second phase, Φ2, of the current operational cycle; the integrating circuit being configured to accumulate charge in proportion to a difference between the charge transferred from the sensor to the integrating circuit by the switching circuit and the charge fed back to the integrating circuit by the second charge feedback circuit; an analog comparing circuit configured to detect accumulated charge at the integrating circuit for a current cycle to determine a polarity of charge feedback for a subsequent cycle, wherein an output of the analog comparing circuit is an analog signal that is one of two voltages based on the polarity of the accumulated charge; and a logic circuit configured to input the analog signal that is the output of the analog comparing circuit and to output a digital output corresponding to the sensed quantity and to provide the polarity of charge feedback determined by the analog comparing circuit to the first charge feedback circuit for controlling the charge fed back to the sensor and also to the second charge feedback circuit for controlling the charge fed back to the integrating circuit.