Gain improvement of a 130 GHz CMOS amplifier by using radial stub as AC ground

Taiki MacHii, Mizuki Motoyoshi, Suguru Kameda, Noriharu Suematsu

研究成果: Conference contribution

1 被引用数 (Scopus)


Low-loss matching circuit is an important issue since sufficient gain cannot be achieved with over-100 GHz CMOS amplifiers. In the case of matching circuit with short stub, the short stub should be terminated to the ground. Since the matching circuit is applied DC bias to operate the FET of amplifier, the ground should not be directly connected the ground (DC ground) but should be AC ground. AC ground with MIM capacitor is widely used in microwave frequency range, but 1/4 \lambda_{g} open stub is used for over-100 GHz amplifier to reduce the loss of the AC ground. In this paper, we examine the losses of open stub using low-impedance line and radial stub. Theoretical analysis based on the series resistance of the conductor, EM simulation which take into account conductor loss and dielectric loss, and the measurement of fabricated stubs show the superiority of the radial stub than the open stub. The fabricated 130 GHz CMOS amplifiers having an input and an output matching circuits with open stubs shows higher gain than that with open stubs.

ホスト出版物のタイトル2020 Asia-Pacific Microwave Conference, APMC 2020 - Proceeding
編集者Jie Sun, Wai Ho Yu
出版社Institute of Electrical and Electronics Engineers Inc.
出版ステータスPublished - 2020 12月 8
イベント2020 Asia-Pacific Microwave Conference, APMC 2020 - Virtual, Hong Kong, Hong Kong
継続期間: 2020 12月 82020 12月 11


名前Asia-Pacific Microwave Conference Proceedings, APMC


Conference2020 Asia-Pacific Microwave Conference, APMC 2020
国/地域Hong Kong
CityVirtual, Hong Kong

ASJC Scopus subject areas

  • 電子工学および電気工学


「Gain improvement of a 130 GHz CMOS amplifier by using radial stub as AC ground」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。