Wideband Digitally Controlled True Time Delay for Beamforming in a 40 nm CMOS Technology

Jiachen Shen, Yi Zhang, Yang Liu, Lin He, Yufeng Guo, Hao Gao

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

Abstract

Wideband beamforming is widely required in the sub-6GHz frequency band for 5G commutation and the next generation wireless communication (B5G). The true time delay is the most crucial component, especially in the sub-6GHz frequency band. This paper presents a new true time delay by using an N-path switch capacitor delay cell to break the tradeoff between bandwidth and delay range by introducing tunable sampling clocks. The non-idealities and limitations are discussed as well. In a 40-nm CMOS technology, the implemented true time delay achieves maximum 900ps delay at 3GHz and 500ps delay at 6GHz with 0.15% variation. Reliability of the design is verified by process variation simulation as well. The proposed topology provides a large delay range with a compact size, which is suitable for sub-6 GHz wideband applications.
Original languageEnglish
Title of host publication2021 IEEE International Symposium on Circuits and Systems, ISCAS 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers
Number of pages4
ISBN (Electronic)9781728192017
ISBN (Print)978-1-7281-9201-7
DOIs
Publication statusPublished - 27 Apr 2021
Event53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021 - VIRTUAL, Daegu, Korea, Republic of
Duration: 22 May 202128 May 2021

Conference

Conference53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021
Country/TerritoryKorea, Republic of
CityDaegu
Period22/05/2128/05/21

Keywords

  • 5G
  • Beamforming
  • CMOS
  • Sub-6 GHz band
  • True time delay
  • Wideband

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