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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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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)
  • Received : 2022.11.21
  • Accepted : 2023.03.06
  • Published : 2024.04.20
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Abstract

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.

Keywords

Acknowledgement

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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