IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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A mixed sample-time error calibration technique in time-interleaved ADCs
Bei YuChixiao ChenFan YeJunyan Ren
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2013 Volume 10 Issue 24 Pages 20130882

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Abstract

Sample-time error between channels degrades resolution of time-interleaved analog-to-digital converters (TIADCs). A calibration method implemented in mixed circuits with low-complexity and fast-convergence is proposed in this paper. The algorithm for detecting sample-time error, which is widely applied to wide-sense stationary input signals, is based on correlation. The detected sample-time error is corrected by a voltage-controlled sampling switch. Experimental result of a 2-channel 200-MS/s 14-bit TIADC shows that the signal-to-noise-and-distortion ratio improves 19.1dB, and the spurious-free dynamic range improves 34.6dB for a 70.12-MHz input after calibration. The convergence time of the calibration is about 20000 sampling intervals.

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© 2013 by The Institute of Electronics, Information and Communication Engineers
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