A low spurious 400M-6GHz SiGe-MMIC direct conversion transceiver using 2fLO LO switching configuration for cognitive radio

Koji Tsutsumi, Fumiki Onoma, Jun Koide, Mikio Uesugi, Noriharu Suematsu, Hiroshi Harada

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

3 Citations (Scopus)

Abstract

A low spurious SiGe-MMIC direct conversion transceiver using 2f LO LO switching configuration for cognitive radio is described. In the proposed configuration, LO signals for Tx and Rx blocks are generated by frequency divider behind switching circuits. By applying this configuration to the transceiver, the offset frequency of maximum Tx spurious in FDD mode is doubled compared to the conventional configuration. Also, theoretical analysis shows that the proposed configuration can lower LO signal spurious level by 12dB. Through these effects, receiver sensitivity degradation by Tx signal can be avoided and required characteristics of Tx BPF is relaxed. The direct conversion transceiver MMIC using 2fLO LO switching configuration is fabricated in 0.18μm SiGe-BiCMOS process. Measured results show a high modulation accuracy over 400M-6GHZ, and low Tx spurious characteristics.

Original languageEnglish
Title of host publicationProceedings of the 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
Pages585-588
Number of pages4
DOIs
Publication statusPublished - 2008
Event2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008 - Atlanta, GA, United States
Duration: 2008 Jun 152008 Jun 17

Publication series

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

Conference

Conference2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
Country/TerritoryUnited States
CityAtlanta, GA
Period08/6/1508/6/17

Keywords

  • Cognitive radio
  • Direct conversion
  • FDD
  • MMICs
  • Multi-band
  • Multi-mode
  • TDD
  • Tx spurious

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