Ultra Broadband Phased-Array Transmitter with Low Phase Error of 1.24-2.8° across 36-91 GHz Supporting 10.8 Gbps 64QAM in 90 nm SiGe

Zheng Liu, Emir Ali Karahan, Kaushik Sengupta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Joint sensing and communication utilizing the large bandwidths and spectral bands distributed across 30-100 GHz provide new opportunities for 6G networks for more optimal spectrum and resource utilization, and environmental awareness. However, adaptive operation and spectral agility needed in such a universal array interface capable of operating across all the licensed/unlicensed/shared bands (30-100 GHz) for intelligent communication and sensing is extremely challenging. In this paper, we focus on an element of this array, particularly the ultrawideband phased array transmitter (Tx) element that maintains extremely low maximum phase error below 0.5 LSB, r.m.s. phase error 0.25 LSB (1.24-2.8 °), and r.m.s. gain error of 0.24-0.35 dB with a 5-bit phase control across 36-91 GHz. The Tx also demonstrates 30-35 dB gain with 10 ∼dB gain control, O P1 d B of 9-13.5 dBm, and a Tx chain efficiency of 10.9% at O P1 d B at 60GHz. The architecture employs 1) broadband commonbase PA with deep learning enabled matching for bandwidth enhancement; 2) vector summing phase shifter with 90° hybridbased bandwidth extension network for ultra-wideband differential quadrature signal generation and phase control; and 3) multi-stage differential VGA with a tailored frequency response. At 60GHz, it supports 10.8 ∼Gb/ s 64-QAM signal with -25.6 ∼dB/- 31.9dBc EVM/ACLR. To the best of the authors' knowledge, this is the first Tx beamformer that covers from 5G FR2 to W band with a fractional bandwidth of 87%.

Original languageEnglish (US)
Title of host publicationESSCIRC 2023 - IEEE 49th European Solid State Circuits Conference
PublisherIEEE Computer Society
Pages497-500
Number of pages4
ISBN (Electronic)9798350304206
DOIs
StatePublished - 2023
Event49th IEEE European Solid State Circuits Conference, ESSCIRC 2023 - Lisbon, Portugal
Duration: Sep 11 2023Sep 14 2023

Publication series

NameEuropean Solid-State Circuits Conference
Volume2023-September
ISSN (Print)1930-8833

Conference

Conference49th IEEE European Solid State Circuits Conference, ESSCIRC 2023
Country/TerritoryPortugal
CityLisbon
Period9/11/239/14/23

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering

Keywords

  • 90° hybrid
  • Beamformer
  • mmWave
  • PA
  • phase shifter
  • phased array
  • SiGe
  • transmitter
  • ultra-wideband

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