System and method for dynamic path-mismatch equalization in time-interleaved ADC
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Disclosed are methods and systems implementing digital background calibration techniques for identifying and remedying dynamic path-mismatch errors in time-interleaved analog-to-digital converters (TI-ADC). The disclosed systems and methods employ a calibration technique specifically focuses on removing the timing skew and input bandwidth mismatches by equalizing each sub-ADC in an array to a common reference ADC using direct input derivative information. The errors are identified by correlating the ensuing conversion error to the input derivatives of various orders to identify the mismatch parameters. Simple passive high-pass filters (HPF) are used to extract input derivatives followed by one-bit quantizers.