A folded edge-coupled transformer balun in GaAs with excellent balance from 9 to 20 GHz

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

3 Citations (Scopus)

Abstract

A folded edge-coupled transformer balun is presented with excellent balance and 3-dB bandwidth from 9 to 20 GHz. Three structures were simulated; straight, folded, spiralled; to study the trade-off between the circuit size and balance performance. A simplified lumped equivalent circuit model of the transformer balun is also shown. The transformer balun was implemented with two-port characterization structures to accurately measure the balance. The measured magnitude and phase imbalances are less than 0.3 dB and 0.7° from 2 to 25 G Hz, surpassing previously reported results for GaAs baluns. The balun was fabricated in a 0.1 mu mathrm{m} GaAs pHEMT technology and occupies 0.24 mm2 . This paper also highlights that the edge-coupling is preferred for GaAs technology baluns due to restrictions in metal fabrication.

Original languageEnglish
Title of host publication2018 48th European Microwave Conference proceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1101-1104
Number of pages4
ISBN (Electronic)9782874870514, 9782874870507
ISBN (Print)9781538652855
DOIs
Publication statusPublished - 2018
Event48th European Microwave Conference, EuMC 2018 - Madrid, Spain
Duration: 25 Sep 201827 Sep 2018

Conference

Conference48th European Microwave Conference, EuMC 2018
CountrySpain
CityMadrid
Period25/09/1827/09/18

Keywords

  • Transformer balun
  • GaAs
  • bandwidth
  • magnitude and phase imbalance

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