A Digital I/Q Correction Technique for a 125-GHz Interferometric Radar with Sub-Micrometer Sensitivity

Daniel Rodriguez, Changzhi Li

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

5 Scopus citations

Abstract

Signal deterioration due to I/Q mismatch may happen in all quadrature direct-conversion receivers, destroying the orthogonality of the demodulated signal and causing a mirrored signal to appear superimposed to the desired signal. This effect is even more pronounced for radar systems over 100 GHz since they are sensitive to small fabrication errors. In addition, for ac-coupled interferometric radars measuring slow movements, coupling distortion is present. In this paper, these issues were analyzed for interferometric radars and then resolved using a novel phase imbalance correction method on a 125 GHz radar. The effectiveness of the proposed solution was verified experimentally. A high sensitivity was demonstrated by successfully measuring a 95-nm sinusoidal movement.

Original languageEnglish
Title of host publication2019 IEEE MTT-S International Microwave Symposium, IMS 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages301-304
Number of pages4
ISBN (Electronic)9781728113098
DOIs
StatePublished - Jun 2019
Event2019 IEEE MTT-S International Microwave Symposium, IMS 2019 - Boston, United States
Duration: Jun 2 2019Jun 7 2019

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
Volume2019-June
ISSN (Print)0149-645X

Conference

Conference2019 IEEE MTT-S International Microwave Symposium, IMS 2019
CountryUnited States
CityBoston
Period06/2/1906/7/19

Keywords

  • I/Q imbalance
  • Interferometric radar
  • distortion
  • phase mismatch
  • signal integrity

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