A Background Calibration Technology for Pipelined ADCs Using Sub-Range Code Bin Reshaping

This paper proposes a background calibration method for pipelined analog to digital converters (ADCs). The method, called sub-range code bin reshaping (SRCBR), estimates maximum and minimum residue voltage of each sub-range with improved accuracy, and compensates DAC errors based on boundary gaps. The SRCBR is a histogram-based method and is robust against non-ideal factors, such as noise and nonlinearities. Simulation results show that, with an equivalent DAC error of 0.2 % and in presence of memory error and residue-amplifier nonlinearity, after calibration, the SFDR and ENOB are improved from 68.15dB and 10.08bit to 95.95dB and 13.32bit.