Continuous-time delta-sigma analog-to-digital converter

A method of operating an analog-to-digital converter (ADC), comprising:

• providing, by a resistor, a first current in response to an analog input;
• generating, by a digital-to-analog converter (DAC), a second current in response to a digital output of the ADC;
• configuring, using one or more configuration control signals, multiple configurable switch circuits to provide a summing node;
• controlling a switch circuit based on an integration control signal to transmit the second current to the summing node;
• combining the first current and the second current at the summing node to generate an integration current;
• integrating the integration current over a capacitor to generate an integration output;
• and
• adjusting the digital output based on the integration output.

A method of using an analog-to-digital converter (ADC), comprising:

• storing a selected mode of a digital-to-analog converter (DAC) in the ADC;
• generating one or more configuration control signals based on the selected mode of the DAC;
• generating an integration control signal based on the selected mode of the DAC;
• configuring, based on the one or more configuration control signals, one of a first terminal of a switch circuit or a second terminal of the switch circuit as a summing node to combine a first current and a second current, the first current being generated in response to an analog input and the second current being generated by the DAC in response to a digital output of the ADC, with the first terminal of the switch circuit being coupled with an output terminal of the DAC and the second terminal of the switch circuit being coupled with a capacitor for integration;
• and
• controlling the switch circuit based on the integration control signal, wherein a combined current resulting from combining the first current and the second current is provided to the capacitor to generate an integration output and the digital output of the ADC is adjusted based on the integration output.