Subsampling models of bandwidth mismatch for time-interleaved converter calibration

Bandwidth mismatch is one of the mechanisms that reduce linearity in time-interleaved analog-to-digital converters (TI-ADCs). Models of bandwidth mismatch have been already proposed in the literature: this brief extends them to subsampling signals, validates them against circuit-level simulations, and investigates their effect on linearity in subsampling applications. The effectiveness of two previously published calibration algorithms for the correction of bandwidth mismatch is shown. The proposed models can thus be used to simulate subsampling TI-ADCs and their calibration algorithms.