Design of 9:4 step-down impedance transformation ruthroff balun with center tap in GIPD technology

Hwann Kaeo Chiou, Hua Yen Chung

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

2 Scopus citations

Abstract

This paper presents a 9:4 step down impedance transformation in glass integrated passive device (GIPD) technology. Unlike traditional Ruthroff balanced-to-unbalanced (balun) having a 1:4 step-up impedance transformation ratio, the proposed 9:4 step-down balun is realized by cascading a 9:1 unto-un transmission line transformer (TLT) and a 1:4 TLT balun. Since the balanced port exhibits low impedance, the proposed step-down balun is suitable for the power combining and impedance transformation for high power amplifier design. Particularly, a center tap with bypass capacitor at the middle of balanced line is intentionally designed to use as DC biasing for the power transistors. The minimal insertion loss is 0.86 dB at 5.3 GHz and the 1-dB bandwidth is from 4.2 GHz to 7 GHz, which is correspondent to 51.6% of fractional bandwidth.

Original languageEnglish
Title of host publication2018 IEEE CPMT Symposium Japan, ICSJ 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages193-196
Number of pages4
ISBN (Electronic)9781538654422
DOIs
StatePublished - 2 Jul 2018
Event2018 IEEE CPMT Symposium Japan, ICSJ 2018 - Kyoto, Japan
Duration: 19 Nov 201821 Nov 2018

Publication series

Name2018 IEEE CPMT Symposium Japan, ICSJ 2018

Conference

Conference2018 IEEE CPMT Symposium Japan, ICSJ 2018
Country/TerritoryJapan
CityKyoto
Period19/11/1821/11/18

Keywords

  • 9:4 step down impedance transformation
  • Ruthroff Balun
  • glass integrated passive device (GIPD)

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