For a simple two step converter, a psudo-random sequence can be injected into the sub-ADC and correlated with the digital output to determine radix errors. See Li and Moon, TCAS II, Sept 2003 or Keane, TCAS I, Jan 2005 for more info. Below is a Matlab script which will extract the radix error from a two stage ADC with PN correlation techniques:

PN_Calibration_High_Level.m

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