Compensating Frequency Response Mismatches in Time Interleaved Analog to Digital Converters

Time interleaving of multiple analog-todigital converters by multiplexing the outputs of (for example) a pair of converters at a doubled sampling rate is by now a mature concept—first introduced by Black and Hodges in 1980. Time interleaving of ADCs offers a conceptually simple method for multiplying the sample rate of existing high-performing ADCs. Time-interleaved analog-to-digital converters (TIADC) require mismatch calibration to achieve high signal-to-noise ratios. In this paper, we present a new blind technique for two channels Time-Interleaved Analog to Digital Converter’s with the improvement of frequency mismatches as well as time offset and bandwidth mismatches. The proposed method overcomes the limitation of traditional gain-timing mismatch model. Keywords— time-interleaved analog-to-digital converter, mismatch caliberation, frequency mismatches

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