Broadband balanced frequency doublers with fundamental rejection enhancement using a novel compensated marchand balun

Ping Han Tsai, Yu Hsuan Lin, Jing Lin Kuo, Zuo-Min Tsai , Huei Wang

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

In this paper, a novel compensation technique is proposed to improve the imbalance of a Marchand balun due to the unequal odd-and even-mode phase velocities of the coupled lines. Using this method, the fundamental rejection of the balanced doubler with the Marchand balun can be effectively enhanced. Two single-balanced doublers using the improved Marchand balun are designed, fabricated, and measured to verify the concept in CMOS processes. One doubler for 15-36-GHz possesses-10-dB conversion gain with the 3-dB bandwidth of 82.4% and the fundamental rejection of 33 dB. The other doubler for 95-150 GHz achieves-7.9-dB conversion gain with the 3-dB bandwidth of 45% and the fundamental rejection of 30 dB. With the proposed compensation technique, these frequency doublers feature wide bandwidths and high fundamental rejections.

Original languageEnglish
Article number6496174
Pages (from-to)1913-1923
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Volume61
Issue number5
DOIs
StatePublished - 15 Apr 2013

Keywords

  • Broadband
  • CMOS
  • frequency doubler
  • fundamental rejection
  • Marchand balun

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