A flexible and scalable structure to compensate frequency response mismatches in time-interleaved ADCs

Authors:
Christian Vogel;Stefan Mendel
Affiliations:
Signal and Information Processing Laboratory, Department of Information Technology and Electrical Engineering, Swiss Federal Institute of Technology Zurich, Zurich, Switzerland;Signal Processing and Speech Communication Laboratory, Graz University of Technology, Graz, Austria
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Year:
2009

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Abstract

In this paper, we present a flexible and scalable structure to compensate frequency response mismatches in time-interleaved analog-to-digital converters (TI-ADCs). The flexibility of the structure allows for designing compensation filters independent of the number of channels that can achieve any desired signal-to-noise ratio due to the scalability of the structure. Therefore, the compensation structure may be used to compensate time-varying frequency response mismatches in TI-ADCs, as well as to reconstruct uniform samples from nonuniformly sampled signals. We analyze the compensation structure, investigate its performance, and demonstrate application areas of the structure through numerous examples.