DC-50GHz wideband phase-compensated 90nm-CMOS active balun design

Kun Long Wu, Kuan Ting Lai, Shu-I Hu, Chi-Yang Chang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


This manuscript explores the output phase imbalance observed in the common-gate common-source transistors, and gives a mathematical formulation in determining the length of the compensation transmission line. To demonstrate the validity of this wideband phase-compensation technique, a DC-50GHz active balun is designed using commercial 90nm-CMOS process and then measured, where the phase imbalance is less than 5o while the magnitude imbalance is within 1dB. All ports are well-matched and positive gain has been sustained up to 50GHz; the output-referred 1dB compression point is around 3dBm. With 3 V and 32.5mA drain bias, the total power consumption is 97.5mW. To our knowledge, this is the widest active balun ever designed with such tight output phase requirement.

Original languageEnglish
Title of host publication2015 Asia-Pacific Microwave Conference Proceedings, APMC 2015
EditorsFan Meng, Wei Hong, Guang-Qi Yang, Zhe Song, Xiao-Wei Zhu
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479987658
StatePublished - 1 Jan 2015
Event2015 Asia-Pacific Microwave Conference, APMC 2015 - Nanjing, China
Duration: 6 Dec 20159 Dec 2015

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2015 Asia-Pacific Microwave Conference, APMC 2015


  • CMOS
  • Wideband
  • active balun
  • distributed amplifier
  • phase compensation

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