Multiport Signal-Flow Analysis to Improve Signal Quality of Time-Interleaved Digital-to-Analog Converters

Youngcheol PARK  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.8   pp.685-689
Publication Date: 2018/08/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.685
Type of Manuscript: PAPER
Category: Electronic Instrumentation and Control
digital-to-analog converter,  signal-flow graph,  s-parameter,  time interleaving,  quadrature-amplitude-modulation,  

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This letter describes a method that characterizes and improves the performance of a time-interleaved (TI) digital-to-analog converter (DAC) system by using multiport signal-flow graphs at microwave frequencies. A commercial signal generator with two TI DACs was characterized through s-parameter measurements and was compared to the conventional method. Moreover, prefilters were applied to correct the response, resulting in an error-vector magnitude improvement of greater than 8 dB for a 64-quadrature-amplitude-modulated signal of 4.8 Gbps. As a result, the bandwidth limitation and the complex post processing of the conventional method could be minimized.