Journal of IKEEE (전기전자학회논문지)

Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
권호 표지
DOI QR코드

DOI QR Code

A Low EMI Spread Spectrum Clock Generator Using TIE-Limited Frequency Modulation Technique

TIE 제한 주파수 변조 기법을 이용한 낮은 EMI 분산 스펙트럼 클록 발생기

  • Piao, Taiming (School of Electronic Engineering, Soongsil University) ;
  • Wee, Jae-Kyung (School of Electronic Engineering, Soongsil University) ;
  • Lee, Seongsoo (School of Electronic Engineering, Soongsil University)
  • Received : 2013.11.13
  • Accepted : 2013.12.13
  • Published : 2013.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

This paper proposed a low EMI spread spectrum clock generator (SSCG) using discontinuous frequency modulation technique. The proposed SSCG is designed for triangular frequency modulation with high modulation depth. When the maximum time interval error (MTIE) of the SSCG is higher than given limit, the output frequency of SSCG is divided by two and used for reducing the time interval error (TIE). This discontinuous frequency modulation technique can effectively reduce the EMI within given limit. The simulated EMI of proposed SSCG was reduced by 18.5dB than that of conventional methods.

본 논문에서는 불연속 주파수 변조 기법을 사용하는 낮은 EMI 분산 스펙트럼 클록 발생기 (SSCG)를 제안한다. 제안된 SSCG는 높은 변조폭을 갖는 삼각 주파수 변조 기법을 사용한다. SSCG의 최대 시간 구간 오차 (MTIE)가 제한 기준을 넘어서면 SSCG의 출력 주파수가 분주기를 거쳐 시간 구간 오차 (TIE)의 값을 감소시킨다. 이러한 불연속 주파수 변조 기법은 주어진 MTIE 제한 기준 내에서 전자기 방사를 효과적으로 감소시킬 수 있다. 이 방법은 일반적인 SSCG보다 전자기 방사를 18.5dB 더 개선하였다.

Keywords

References

  1. S. Han, S. Park, and Y. Lee, "Prediction of Dynamic Power Consumption and IR Drop Analysis by Efficient Current Modeling", Journal of IKEEE, vol. 8, no. 1, pp. 63-72, Jun. 2004.
  2. D. Shin, B. Yu, T. Kim, and H. Cho, "Spread Spectrum Clock Generator with Multi Modulation Rate Using DLL", Journal of IKEEE, vol. 15, no. 1, pp. 23-28, Mar. 2011.
  3. H. Chang, I. Hua, and S. Liu, "A spread-spectrum clock generator with triangular modulation," IEEE Journal of Solid-State Circuits, vol. 38, no. 4, pp. 673-676, Apr. 2003. https://doi.org/10.1109/JSSC.2003.809521
  4. M. Kokubo, T. Kawamoto, T. Oshima, T. Noto, M. Suzuki, S. Suzuki, T. Hayasaka, T. Takahashi, and J. Kasai, "Spread-spectrum clock generator for serial ATA using fractional PLL controlled by ${\Delta}{\Sigma}$ modulator with level shifter," ISSCC Digest of Technical Papers, pp. 160-90, Feb. 2005.
  5. T. Steinecke, "Low-jitter frequency-modulated PLL", Proceedings of Asia-Pacific Symposium on Electromagnetic Compatibility, pp. 329-332, May 2012.
  6. Y. Komatsu, T. Ebuchi, T. Hirata and T. Yoshikawa, "Bi-directional AC coupled interface with adaptive spread spectrum clock generator", Proceedings of IEEE Asian Solid-State Circuits Conference, pp. 71-74, Nov. 2007.
  7. T. Xia and P. Peng, "A spread-spectrum clock generator with dual-voltage controlled oscillator", Proceedings of TAISA Conference, pp. 1-4, Jun. 2008.