Systems for sub digital-to-analog converter gain trim in successive-approximation-register analog-to-digital converters

摘要

A system for a successive-approximation-register analog-to-digital converter (SAR ADC) includes a gain trim module and an SAR control module. The gain trim module is configured to selectively trim a gain of a sub capacitive digital-to-analog converter (DAC) of the SAR ADC. The SAR control module controls the gain trim module based on an accumulated error associated with a main capacitive DAC of the SAR ADC.