An analog-to-digital converter system that includes a pipeline including N successively-cascaded signal converters, each converting, according to a first clock signal, a respective portion of an input signal of the pipeline into digital codes, a code aligner for receiving and aligning the digital codes from the signal converters in the pipeline into a digital output of the system, an error extractor coupled to an amplifier input node of a selected one signal converter via a first switch for extracting an error signal, and a load system coupled to the amplifier input node of the selected one signal converter via a second switch.