A 23-to-29GHz Receiver with mm-Wave N-Input-N-Output Spatial Notch Filtering and Autonomous Notch-Steering Achieving 20-to-40dB mm-Wave Spatial Rejection and -14dBm In-Notch IP1 dB

Linghan Zhang, Masoud Babaie

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)
9 Downloads (Pure)

Abstract

Digital beamforming receivers (RXs) support MIMO operation and offer great flexibility and accuracy in multi-beam formation and calibration. However, compared with analog phased-array and hybrid systems, due to the absence of any rejection for spatial in-band blockers, the RX/ADC dynamic range and linearity should be high enough to prevent array saturation. Therefore, the use of self-steering spatial notch filters (SNFs) is necessary to aid the digital beamformers and reduce RX/ADC power consumption while strong blockers exist. To address that, the sub-6GHz RXs in [1], [2] synthesize a baseband spatial notch impedance and translate it to RF by passive mixers. However, this technique cannot be directly applied at mm-wave frequencies as the impedance translational performance of the passive mixers degrades significantly. Hence, the mm-wave beamformer in [3] realizes a cascadable SNF at an intermediate frequency (IF). However, the front-end mm-wave components like mixers and phase shifters have to tolerate strong blockers, thus degrading RX linearity. Besides, it uses multiple IF buffers and VGAs for signal scaling and combining, which could be power-hungry if a similar method is adopted to realize a mm-wave SNF. To improve on those limitations, we propose a scalable SNF structure, which (1) suppresses the strongest in-band blocker at mm-wave frequencies, (2) supports N-input-N-output MIMOs, and (3) requires no active blocks except the phase shifters. A two-step autonomous notch-steering technique is also developed to adjust the SNF notch direction power-efficiently and accurately.

Original languageEnglish
Title of host publication2022 IEEE International Solid- State Circuits Conference (ISSCC)
Subtitle of host publicationDigest of technical papers
EditorsLaura C. Fujino
Place of PublicationDanvers
PublisherIEEE
Pages82-84
Number of pages3
ISBN (Electronic)978-1-6654-2800-2
ISBN (Print)978-1-6654-2801-9
DOIs
Publication statusPublished - 2022
Event2022 IEEE International Solid- State Circuits Conference (ISSCC) - Online at San Francisco, United States
Duration: 20 Feb 202226 Feb 2022

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume2022-February
ISSN (Print)0193-6530

Conference

Conference2022 IEEE International Solid- State Circuits Conference (ISSCC)
Abbreviated titleISSCC 2022
Country/TerritoryUnited States
CityOnline at San Francisco
Period20/02/2226/02/22

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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