On-chip single-to-balanced bandpass filters with wide upper stopband

Chiou Wen You, Chin Lung Tsai, Yo Shen Lin

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

2 Scopus citations

Abstract

In this work, on-chip single-to-balanced bandpass filters with wide upper stopband are proposed. The proposed filter integrate the functions of bandpass filter and balun using a simple multicoupled line structure along with loaded capacitors. The use of inductor is avoided such that they can achieve very compact size when implemented on chip. They can be designed according to the desired bandpass response and reference impedance. Specifically, two single-to-balanced filters of 2nd-and 3rd-order bandpass response are demonstrated using the GaAs pHEMT process. Their chip sizes are 1×1 mm2 and 1.5×1 mm2 for a center frequency of 5.5 GHz and a bandwidth of about 18%. The corresponding electrical sizes are only about 0.036λg × 0.045λg and 0.062λg × 0.043λg, respectively. Good balanced performances are observed with common-mode rejection ratio better than 29 dB. Notably, very wide upper stopbands up to the highest measurement frequency of 67 GHz are also achieved.

Original languageEnglish
Title of host publication2011 IEEE MTT-S International Microwave Symposium, IMS 2011
DOIs
StatePublished - 2011
Event2011 IEEE MTT-S International Microwave Symposium, IMS 2011 - Baltimore, MD, United States
Duration: 5 Jun 201110 Jun 2011

Publication series

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

Conference

Conference2011 IEEE MTT-S International Microwave Symposium, IMS 2011
Country/TerritoryUnited States
CityBaltimore, MD
Period5/06/1110/06/11

Keywords

  • Balun
  • bandpass filter
  • coupled-line
  • GaAs

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