Analog-to-digital converter metastability adjustment

A method for adjusting a metastability error in an analog-to-digital converter (ADC), the method comprising:

• determining whether a comparator in a first stage of the ADC has settled to a determinate binary state at a first time;
• determining whether the comparator in the first stage of the ADC has settled to the determinate binary state at a second time, wherein the first time is a first specified time period before the second time;
• and
• adjusting an output of the first stage when it is determined that the comparator in the first stage had not settled to the determinate binary state at at least one of the first time or the second time.

A method for determining a metastability error in an analog-to-digital converter (ADC), the method comprising:

• calculating the metastability error for a specified analog input value by:
• recurrently:
• applying the specified analog input value to an input of the ADC, wherein the ADC is configured to add a varying dither signal to an analog input and subtract the varying dither signal from a digital output;
• and
• recording the digital output value and a sign value of a comparator in a first stage of the ADC;
• and
• determining a central tendency of a product of the recorded digital output values and the corresponding sign values to determine the metastability error for the specified analog input value.