Title :
Adaptive calibration of gain and offset errors for time-interleaved ADCs
Author :
Xu, Gao-Xue ; Yan, Bo ; Li, Qiang ; Li, Guang-Jun
Author_Institution :
Centre for Commun. Circuits & Syst., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Time-interleaved (TI) Analog-to-Digital Converters (ADC) are efficient for high-speed data acquisition. However, mismatches among different channels in a TIADC system due to manufacturing process variations cause distortion in the sampled signal and degrade the SNR and SFDR significantly. The offset and gain mismatches are the two important error sources for the TIADC system. In this paper, a methodology based on Least Mean Square (LMS) adaptive algorithm is proposed for simultaneous compensation of the gain and offset mismatches. The proposed method is also adaptive to the slow changes of the mismatches caused by temperature variation and aging effect. Numerical simulations are conducted to validate the adaptive algorithm.
Keywords :
analogue-digital conversion; calibration; error compensation; least squares approximations; SFDR; SNR; TIADC system; aging effect; gain adaptive calibration; high-speed data acquisition; least mean square adaptive algorithm; manufacturing process variations; numerical simulations; offset error compensation; temperature variation; time-interleaved ADC; time-interleaved analog-to-digital converters; Adaptation model; Adaptive systems; Algorithm design and analysis; Calibration; Estimation; Gain; Heuristic algorithms;
Conference_Titel :
Microelectronics and Electronics (PrimeAsia), 2010 Asia Pacific Conference on Postgraduate Research in
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-6735-8
Electronic_ISBN :
978-1-4244-6736-5
DOI :
10.1109/PRIMEASIA.2010.5604956
