MEASURING AND CORRECTING NON-LINEARITY OF AN INTERNAL MULTI-BIT ANALOG-TO-DIGITAL CONVERTER IN A DELTA-SIGMA ANALOG-TO-DIGITAL CONVERTER

摘要

An internal ADC in a delta-sigma ADC is characterized using inherent delta-sigma ADC circuitry. In one embodiment, a constant DC value is applied as the input signal. The sum of the constant DC value and a feedback signal is integrated. Then, a digital approximation including the integrated sum is generated. The feedback signal is generated and allows ramping of the integrated sum.