Optimal equivalent-time sampling for periodic complex signals with digital down-conversion
- Resource Type
- Article
- Authors
- 김경원; 권헌국; 김명돈
- Source
- ETRI Journal, 46(2), pp.238-249 Apr, 2024
- Subject
- 전자/정보통신공학
- Language
- English
- ISSN
- 2233-7326
1225-6463
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.