Methods and apparatus to estimate analog to digital converter (adc) error

A system, comprising:

• a first analog-to-digital converter (ADC);
• and
• a second ADC;
• and
• controller circuitry,
• wherein the controller circuitry is configurable to:
• provide a first dither signal, in addition to an input voltage, to both the first ADC and the second ADC;
• determine a first output signal from the first ADC and a first output signal from the second ADC, responsive to providing the first dither signal, in addition to the input voltage, to both the first ADC and the second ADC;
• provide a second dither signal, in addition to the input voltage, to the first ADC, and the first dither signal, in addition to the input voltage, to the second ADC, wherein the second dither signal is different from the first dither signal;
• determine a second output signal from the first ADC, responsive to providing the second dither signal, in addition to the input voltage, to the first ADC and the first dither signal, in addition to, the input voltage, to the second ADC;
• and
• determine an error value based on the first output signal from the first ADC, the first output signal from the second ADC, and the second output signal from the first ADC.