DAC error measurement method and apparatus

A digital-to-analog converter (DAC) error measurement apparatus, comprising:

• an analog-to-digital converter (ADC) configured to digitize a measurement input of the ADC to generate a digital output and use the digital output as an input, wherein the ADC comprises a feedback DAC, and wherein the measurement input comprises a square wave signal with a constant frequency, a direct-current signal at a constant logical level, and an analog output of the feedback DAC, which is configured to provide the analog output to the ADC based on a second input;
• a measurement selection module configured to:
• receive the digital output as the input;
• and
• provide the second input to the feedback DAC based on the digital output, wherein the measurement selection module is further configured to provide a measured digit in the digital output to a separately selected source cell and provide remaining digits in the digital output to remaining source cells, wherein the measured digit is a flippable digit, and wherein the remaining digits are non-flipping digits;
• and
• a measurement module configured to measure an amplitude of the digital output based on the digital output.