Fast Algorithms for Blind Calibration in Time-Interleaved Analog-to-Digital Converters

We present a digital background technique for correcting the time and gain mismatches in a time-interleaved analog-to-digital converter (ADC) system. The proposed blind calibration is applicable to any number of time-interleaved ADCs and requires only modest oversampling. Simulation results show fast convergence and desirable detection accuracy. After the mismatch errors detection, the resulting signal to noise ratio (SNR) of the output signal is shown to be higher than the SNR of the input signal in a 16-ADC system.