Behnaz Papari, Davud Asemani, Ali Khakpour
(Faculty of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran 15875-4416, Iran)
Abstract：High spectral efficiency is essential in design of multimedia communication systems such as L-band mobile in addition to various requirements of transmission quality. Time-interleaved A/D converter (TI-ADC) is an effective candidate to implement wide-band ADC with relatively slow circuits accounting for digital spectrum management. However, practical performance of TI-ADC is largely limited because of mismatches between different channels originated from manufacturing process variations. In this paper, a blind adaptive method is proposed to correct gain mismatch errors in TI-ADC，and it is verified through simulations on a two-channel TI-ADC. In proposed method, gain mismatch error is estimated and corrected in an adaptive scheme. Proposed compensated TI-ADC architecture is structurally very simple and hence suitable for realization in integrated circuits. Besides, proposed digital compensation algorithm not only is computationally efficient but also provides an improvement of 32.7 dB in the performance of two-channel TI-ADC.
Key words：time-interleaved A/D converter (TI-ADC); wide-band communications; time-division multiple access (TDMA)
CLD number： TN79 Document code： A
Article ID： 1674-8042(2012)02-0157-06 doi： 10.3969/j.issn.1674-8042.2012.02.012
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