36-40 GHz TX/RX beamformers for 5G mm-wave phased-array

Chun Nien Chen, Yi Hsien Lin, Yin Lin Liu, Wei Jun Liao, Yu Hsiang Nien, Hsin Chia Lu, Tsung Heng Tsai, Tian Wei Huang, Huei Wang

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

9 Scopus citations


A 36-40 GHz 4-element Tx and Rx beamformer chip set for the fifth generation communication millimeter wave (5G mm-Wave) phased-array applications is presented in this paper. The separated Tx/Rx beamformer chips have 4-bit (22.5°) phase control with 25° phase compensation, and 40 dB peak gain per channel with 20 dB gain control. All of the gate biases, gain and phase tuning functions are controlled by the mixed-signal integrated circuits embedded in the chips, programmable by the microcontroller. The chips are fabricated using TSMC 65-nm CMOS process. The measured O P i d B per channel of the Tx beamformer is 12 dBm, and NF (noise figure) of the Rx beamformer is 6-9 dB. The Tx/Rx beamformers measurements performed less than 2 dB RMS gain error and 5.5 0 RMS phase error with 360° phase tuning, and ±5° phase variation with 20 dB gain tuning. To the author's knowledge, these chips are the first beamformers in 65-nm CMOS for the FCC 5G mm-Wave 37 GHz (37-38.6 GHz) and 39 GHz (38.6-40 GHz) phased-array applications. This chip set will be the unit cell to be integrated with antenna arrays to construct 32 or 64-element phased-array systems in the near future.

Original languageEnglish
Title of host publication2018 Asia-Pacific Microwave Conference, APMC 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9784902339451
StatePublished - 16 Jan 2019
Event30th Asia-Pacific Microwave Conference, APMC 2018 - Kyoto, Japan
Duration: 6 Nov 20189 Nov 2018

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference30th Asia-Pacific Microwave Conference, APMC 2018


  • 5G mm-Wave
  • 65-nm CMOS
  • Beamforming
  • FCC
  • Mixed-signal
  • Phased-array


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