Abstract: An analogue-to-digital converter for converting an analogue input signal into a digital output signal, the analogue-to-digital converter including two conversion paths, each configured to receive a version of the analogue input signal and convert it into a digital bit stream, a first feedback loop configured to provide feed-back, to both paths, that is indicative of a difference between the digital bit streams output by the two paths, and a second feedback loop configured to feed-back, to both paths, that is indicative of an average of the digital bit streams output by the two paths.

Abstract: Methods of measuring capacitance error in a successive approximation register (SAR) analog to digital converter (ADC) are described, including a method in which said ADC includes a register and a digital to analog converter (DAC), and the method comprises connecting a first capacitance associated with a first bit of the DAC between a first reference voltage and a second reference voltage, connecting a first set of one or more capacitances associated with one or more other bits of the DAC between the first reference voltage and a third reference voltage, connecting the first capacitance between a first node and the third reference voltage, connecting the first set of one or more capacitances between the first node and the second reference voltage, and measuring a voltage at the first node to determine a representation of a difference between the first capacitance and a total capacitance of the first set of one or more capacitances.

Abstract: Methods of measuring capacitance error in a successive approximation register (SAR) analog to digital converter (ADC) are described, including a method in which said ADC includes a register and a digital to analog converter (DAC), and the method comprises connecting a first capacitance associated with a first bit of the DAC between a first reference voltage and a second reference voltage, connecting a first set of one or more capacitances associated with one or more other bits of the DAC between the first reference voltage and a third reference voltage, connecting the first capacitance between a first node and the third reference voltage, connecting the first set of one or more capacitances between the first node and the second reference voltage, and measuring a voltage at the first node to determine a representation of a difference between the first capacitance and a total capacitance of the first set of one or more capacitances.

Abstract: An analogue-to-digital converter for converting an analogue input signal into a digital output signal, the analogue-to-digital converter including two conversion paths, each configured to receive a version of the analogue input signal and convert it into a digital bit stream, a first feedback loop configured to provide feed-back, to both paths, that is indicative of a difference between the digital bit streams output by the two paths, and a second feedback loop configured to feed-back, to both paths, that is indicative of an average of the digital bit streams output by the two paths.