Design of well-behaved low-loss millimetre-wave CMOS transmission lines

S. Amakawa, A. Orii, K. Katayama, K. Takano, M. Motoyoshi, T. Yoshida, M. Fujishima

研究成果: Conference contribution

19 被引用数 (Scopus)

抄録

It is a challenge to design single-mode transmission lines for above 100 GHz following strict design rules of modern CMOS processes. This paper reports characteristics of three types of microstrip lines in 65 nm CMOS up to 325 GHz, designed with or without using an auto-dummy exclusion layer. The lowest-loss design among the three is a shielded microstrip protected with an exclusion layer. The metal density requirement is met, as is commonly done, by placing sidewalls as far from the signal line as allowed by the design rules. The other two designs are microstrips without sidewalls or the exclusion layer. One of them has high-density auto dummy fill inserted by the foundry and shows significantly higher attenuation than the shielded microstrip. The other is filled with low-density fill that prevents auto dummy fill from being inserted. It is only marginally lossier than the shielded microstrip. The microstrips without sidewalls are found to exhibit more well-behaved attenuation especially above 100 GHz. The frequency dependence of the attenuation of the shielded microstrip, on the other hand, exhibits ripples, indicating possible presence of spurious modes. Attenuation constants estimated by multiline TRL (thru-reflect-line) from lines of various lengths indicate that the longest line measured should be very long, perhaps 2mm or longer, for the estimates to be reliable.

本文言語English
ホスト出版物のタイトル2014 18th IEEE Workshop on Signal and Power Integrity, SPI 2014 - Proceedings
出版社IEEE Computer Society
ISBN(印刷版)9781479935994
DOI
出版ステータスPublished - 2014
外部発表はい
イベント18th IEEE Workshop on Signal and Power Integrity, SPI 2014 - Ghent, Belgium
継続期間: 2014 5月 112014 5月 14

出版物シリーズ

名前2014 18th IEEE Workshop on Signal and Power Integrity, SPI 2014 - Proceedings

Other

Other18th IEEE Workshop on Signal and Power Integrity, SPI 2014
国/地域Belgium
CityGhent
Period14/5/1114/5/14

ASJC Scopus subject areas

  • 信号処理

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