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Novel swapping technique for background calibration of capacitor mismatching in pipeline ADCS

A novel swapping technique for calibration of the stage non-linear errors in Pipeline ADCs is proposed in this paper. The algorithm obtains an estimation of the mismatching between sampling capacitors in practical SC implementations of the multiplying-DAC without the necessity of interrupting the converter operation, and therefore, suitable for both foreground and background calibration applications. This work overcomes the practical limitations of previous adaptive approaches based on the capacitor swapping introducing a novel modulation scheme which minimizes the impact on the analogue part and employs a simple calibration logic.