A new approach to cancellation of harmonic interferences in intelligent cyclic A/D converters

The paper presents a new approach to cancellation of harmonic interferences in so called intelligent cyclic A/D converters. The approach is based on application of the extended multi-dimensional algorithm, which estimates simultaneously values of the input sample and amplitudes of in-phase and quadrature (I/Q) components of sinusoidal interference which are taken into account for proper calculation of the input sample code. Implementation of the extended algorithm in the intelligent cyclic A/D converters requires only insignificant changes in the digital part of the converter and does not increase their production costs. The results of selected simulation experiments for the standard and extended adaptive conversion algorithms are discussed. They show that application of the proposed solution enables efficient operation of the A/D converters even in conditions of strong interferences.