Differential-To-Common-Mode Conversion Suppression Using Mushroom Structure on Bent Differential Transmission Lines
- Authors
- Lee, Seungjin; Lim, Jaehyuk; Oh, Sangyeol; Kim, Yonghoon; Oh, Dan; Lee, Jaehoon
- Issue Date
- 4월-2019
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Bend discontinuity; common-mode noise; differential signaling; differential-to-common-mode conversion noise; mushroom structure; right-angle bent differential lines
- Citation
- IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY, v.9, no.4, pp.702 - 711
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
- Volume
- 9
- Number
- 4
- Start Page
- 702
- End Page
- 711
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/66428
- DOI
- 10.1109/TCPMT.2019.2895310
- ISSN
- 2156-3950
- Abstract
- In this paper, we propose a method to suppress differential-to-common-mode conversion noise from right-angle bent differential lines by installing a mushroom structure on the narrow inner line. We assessed the mode conversion noise suppression characteristics of the proposed structure by analyzing dispersion diagrams. The proposed structure exhibits differentialto-common-mode conversion (S-cd21) below -20 dB up to 6 GHz, while S-cd21 of conventional right-angle bent differential lines is only maintained below -20 dB for frequencies up to 1.04 GHz. In addition, we suggest that further enhancements of the mode conversion suppression bandwidth can he achieved by installing multiple distributed mushroom structures on right-angle bent differential lines. The use of multiple distributed mushrooms enabled us to achieve a wider frequency bandwidth by compensating more fully for the phase difference between the inner and outer lines. Therefore, the right-angle bent differential lines with multiple distributed mushrooms can suppress mode conversion noise under -20 dB up to 10 GHz. We assessed the performance of our proposed structure by conducting measurements in both the frequency and time domains. We obtained a good agreement between our experimental and numerical results. In addition, we measured eye diagrams to demonstrate that the proposed structures suppress differential-to-common-mode conversion noise without degrading the differential signaling quality.
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Collections - Graduate School > Department of Computer Science and Engineering > 1. Journal Articles
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