Patent ID: RE41371

Claim:
An analog to digital converter, comprising: a first stage for developing a set of most significant bits from an analog input signal and for producing analog residue signals (RA, RB) corresponding to respective differences between the analog input signal and threshold values directly above and below, respectively, the analog input signal; and a second stage (AMPA, AMPB, ADC 2 ) for developing a set of lesser significant bits from the analog residue signals (RA, RB) , wherein the analog to digital converter further comprises: means (CA, CB) for reversing the analog residue signals (RA, RB) ; offset detection means (COD, DOD) coupled to the second stage (AMPA, AMPB, ADC 2 ) for retrieving offset data (Offset COM , Offset DIFF ) representative of offset errors; and offset correction means (AD 1 , AD 2 , OCA, OCB) coupled to receive the offset data (Offset COM , Offset DIFF ) for correcting the offset errors.