Error extraction method for foreground digital correction of pipeline analog-to-digital converter

An error extraction method for foreground digital correction of a pipeline analog-to-digital converter including: acquiring a transmission curve of a pipeline analog-to-digital converter, and controlling an input signal to be within a sub-segment 0 of the transmission curve; during extraction of error information of an ith pipeline stage, setting a magnitude of the input signal according to Formula (I); locking the outputs of all previous-stage comparators in the ith pipeline stage of the pipeline analog-to-digital converter; and completing, according to original output code of the pipeline analog-to-digital converter, error extraction by means of adaptive iteration, stage-by-stage, sequentially from a last stage to a first stage of a pipeline. During quantization of error value, the invention performs, by means of a fitting-based adaptive algorithm, foreground extraction of a capacitance mismatch error, a gain bandwidth error, and a kickback error in each stage of the pipeline, without any additional circuit.