Investigation of different input-matching mechanisms used in wide-band LNA design

Shu-I Hu*, Mark S.C. Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


This paper analyzes different input-matching mechanisms used in designing the wide-band amplifiers in general, and the low noise amplifiers (LNA) in particular, and their corresponding noise impact. Among them, the most promising one is the reactive-feedback circuit configuration, which is a combination of high-frequency inductive feedback and low frequency capacitive feedback. In this paper the simulated result that both matched input impedance and low noise temperature T n can be achieved simultaneously over a wide bandwidth in the single-ended low noise amplifier is proved mathematically and is well interpreted. This understanding of reactive feedback is crucial for the future development of ultra-wide-band low-noise amplifiers.

Original languageEnglish
Pages (from-to)221-245
Number of pages25
JournalInternational Journal of Infrared and Millimeter Waves
Issue number2
StatePublished - 1 Feb 2005


  • Capacitive feedback
  • Inductive feedback
  • Input matching
  • LNA
  • Reactive feedback
  • Resistive feedback
  • Wide-band

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