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J Electromagn Eng Sci > Volume 17(1); 2017 > Article
Journal of Electromagnetic Engineering and Science 2017;17(1):39-43.
DOI: https://doi.org/10.5515/JKIEES.2017.17.1.39   
Co-Simulation for Systematic and Statistical Correction of Multi-Digital-to-Analog-Convertor Systems
Youngcheol Park1, Hoijin Yoon2
1Department of Electronics Engineering, Hankuk University of Foreign Studies
2Department of Computer Engineering, Hyupsung University
Correspondence:  Youngcheol Park,Email: ycpark@hufs.ac.kr
In this paper, a systematic and statistical calibration technique was implemented to calibrate a high-speed signal converting system containing multiple digital-to-analog converters (DACs). The systematic error (especially the imbalance between DACs) in the current combining network of the multi-DAC system was modeled and corrected by calculating the path coefficients for individual DACs with wideband reference signals. Furthermore, by applying a Kalman filter to suppress noise from quantization and clock jitter, accurate coefficients with minimum noise were identified. For correcting an arbitrary waveform generator with two DACs, a co-simulation platform was implemented to estimate the system degradation and its corrected performance. Simulation results showed that after correction with 4.8 Gbps QAM signal, the signal-to-noise-ratio improved by approximately 4.5 dB and the error-vector-magnitude improved from 4.1% to 1.12% over 0.96 GHz bandwidth.
Key words: Digital-to-Analog-Converter, Millimeter-Wave, Quadrature Modulation, Signal Generator, Wireless System
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