ETRI Journal

  • 제46권2호
  • /
  • Pages.238-249
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  • 2024
  • /
  • 1225-6463(pISSN)
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  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
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Optimal equivalent-time sampling for periodic complex signals with digital down-conversion

  • Kyung-Won Kim (Terrestrial & Non-Terrestrial Integrated Telecommunications Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Heon-Kook Kwon (Terrestrial & Non-Terrestrial Integrated Telecommunications Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Myung-Don Kim (Terrestrial & Non-Terrestrial Integrated Telecommunications Research Laboratory, Electronics and Telecommunications Research Institute)
  • 투고 : 2022.11.21
  • 심사 : 2023.03.06
  • 발행 : 2024.04.20
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초록

Equivalent-time sampling can improve measurement or sensing systems because it enables a broader frequency band and higher delay resolution for periodic signals with lower sampling rates than a Nyquist receiver. Meanwhile, a digital down-conversion (DDC) technique can be implemented using a straightforward radio frequency (RF) circuit. It avoids timing skew and in-phase/quadrature gain imbalance instead of requiring a high-speed analog-to-digital converter to sample an intermediate frequency (IF) signal. Therefore, when equivalent-time sampling and DDC techniques are combined, a significant synergy can be achieved. This study provides a parameter design methodology for optimal equivalent-time sampling using DDC.

키워드

과제정보

This research was supported by the Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT; no. 2020-0-00180, "A study for fundamental design and development of 300 GHz channel sounder").

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