Blind and reference channel-based time interleaved ADC calibration schemes: a comparison

Rosario F. Cimmino; Francesco Centurelli; Pietro Monsurrò; Francesco Romano; Alessandro Trifiletti

doi:10.1117/12.2232969

27 July 2016 Blind and reference channel-based time interleaved ADC calibration schemes: a comparison

Rosario F. Cimmino, Francesco Centurelli, Pietro Monsurrò, Francesco Romano, Alessandro Trifiletti

Proceedings Volume 9906, Ground-based and Airborne Telescopes VI; 990631 (2016) https://doi.org/10.1117/12.2232969
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Many digital background calibration techniques exist which correct for offset, gain, timing and bandwidth mismatches in time-interleaved (TI) ADCs. Some require an additional reference channel, whereas others are blind and rely on the presence of a band where no signal is present (usually around the Nyquist frequency) or exploit other properties of the input signal. Blind calibration techniques, which don’t use a reference channel, are suitable for correction of commercial TI-ADCs, or TI-ADC systems using commercial ADCs as channels. Techniques employing additional channels require a more complex layout (especially for the clock tree) and need an additional ADC, whose overhead cost is significant, especially for 2- or 4- channel TI-ADCs. However, we show that the estimation process is faster and more accurate when a reference channel is present, and many different error models can be used (exploiting different points in the accuracy / complexity trade-off).

Citation Download Citation

Rosario F. Cimmino, Francesco Centurelli, Pietro Monsurrò, Francesco Romano, and Alessandro Trifiletti "Blind and reference channel-based time interleaved ADC calibration schemes: a comparison", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990631 (27 July 2016); https://doi.org/10.1117/12.2232969

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