A Millimeter-Wave Front-End for FD/FDD Transceivers Featuring an Embedded PA and an N-Path Filter Based Circulator Receiver

Masoud Pashaeifar*, Leo C. N. de Vreede, Morteza S. Alavi

*Corresponding author for this work

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

Abstract

This work presents an ultra-compact single-antenna FD/FDD transceivers front-end. It comprises a nonreciprocal circulator, RX, and an integrated power amplifier (PA). In the proposed circulator, we devise a ring quarter-wave transmission line topology with adjusted characteristic impedances to improve TX-to-antenna insertion loss and TX-to-RX isolation. Besides, an AND-gate switching-based N-path filter is proposed to realize the circulator's nonreciprocal gyrator while acting as a mixer-first RX. Owing to the ultra-compact N-path filter structure, the circulator occupies only 0.38mm 2 core area. Over a 27.1-to-31.1GHz band, the realized front-end offers >20dB TX-to-RX isolation while its measured TX-to-antenna insertion loss is 1.7~2.2dB. The RX path tolerates the PA's blocker signal, achieving 5dBm in-band and 13dBm out-of-band B 1dB. Moreover, the PA delivers 15.15dBm peak output power with 33% drain efficiency. Our front-end prototype occupies only 0.7mm 2 , including circulator, PA, quadrature hybrid coupler LO generators, and baseband circuits.
Original languageEnglish
Title of host publicationProceedings of the 2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)
Place of PublicationDanvers
PublisherIEEE
Pages11-14
Number of pages4
ISBN (Electronic)978-1-6654-9611-7
ISBN (Print)978-1-6654-9612-4
DOIs
Publication statusPublished - 2022
Event2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) - Denver, United States
Duration: 19 Jun 202221 Jun 2022

Publication series

NameDigest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
Volume2022-June
ISSN (Print)1529-2517

Conference

Conference2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)
Country/TerritoryUnited States
CityDenver
Period19/06/2221/06/22

Keywords

  • Blocker-tolerant receiver
  • CMOS circulator
  • FDD
  • full-duplex
  • mm-wave
  • N-path filter
  • power amplifiers

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