General analysis on the impact of phase-skew in time-interleaved ADCs

Authors:
Manar El-Chammas;Boris Murmann
Affiliations:
Department of Electrical Engineering, Stanford University, Stanford, CA;Department of Electrical Engineering, Stanford University, Stanford, CA
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers - Special issue on ISCAS2008
Year:
2009

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Abstract

Time-interleaved analog-to-digital converters (TIADCs) are sensitive to various mismatches that distort the sampled signal. Standard TIADC analysis assumes a narrowband sinusoidal input, which may result in pessimistic matching constraints for system-specific ADCs used with wideband input signals. Closed-form expressions bounding the acceptable phase-skew for wideband systems are derived and are validated through simulations. In one of the examples presented, it is shown that standard analysis can overconstrain the bound on acceptable phase-skew variance by a factor of three.