A subband FFT-based method for static errors compensation in Time-Interleaved ADCs

Time-interleaving several Analog to Digital Converters (ADC) is considered as efficient solution to significantly increase the sampling rate. Unfortunately, due to the manufacturing process, static errors in Time-Interleaved Analog to Digital Converter (TIADC) often generate undesirable spurs which reduce the TIADC effective resolution. In this paper we propose a new blind and online digital calibration method for offset and gain mismatch based on subband FFT decomposition technique. Numerical simulations and some implementation issues are used to show the efficiency of the proposed calibration architecture.