A 76.5-92.6 GHz CMOS LNA Using Two-Port kQ-Product Theory for Transformer Design

Youming Zhang, Zhennan Wei, Xusheng Tang, Linghan Zhang, Fengyi Huang

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This letter presents a convenient approach based on the two-port kQ-product theory to analyze the influence of interwinding capacitive coupling on the efficiency of the transformer. It is demonstrated that a transformer with proper size can benefit from the interwinding capacitive coupling to maximize its efficiency at a desired frequency. The proposed design approach is used in a W-band low-noise amplifier (LNA) fabricated with the 40-nm CMOS process to optimize the insertion loss of the input transformer-based balun. Thanks to the approach, the W-band LNA achieves a minimum noise figure of 5.7 dB, a maximum gain of 18.5 dB, and a 3-dB bandwidth of 76.5-92.6 GHz, while consuming 23.4 mW from a 0.9-V supply.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
DOIs
Publication statusE-pub ahead of print - 2022

Keywords

  • Baluns
  • Couplings
  • Gain
  • kQ-product
  • low-noise amplifier
  • millimeter-wave (mmWave)
  • Noise measurement
  • Semiconductor device measurement
  • transformer
  • Transformers
  • W-band.
  • Windings

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