A 2.4-5.4-GHz wide tuning-range CMOS reconfigurable low-noise amplifier

Chang Tsung Fu*, Chun Lin Ko, Chien-Nan Kuo, Ying Zong Juang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


A 2.45.4-GHz CMOS reconfigurable low-noise amplifier (LNA) is designed. It consists of two stages: a broadband input stage for a steady input matching and noise performance, and a reconfigurable band-selective stage which provides a wide-range frequency tuning from 2.4 to 5.4 GHz and a 12-dB stepped gain with linearity adjustment. The frequency tuning is conducted by a multitapped switching inductor and varactors. Careful design of the switching inductor achieves consistent performance among frequency configurations. The stepped gain and linearity adjustment are provided by a size-switchable transistor with a variable biasing. Fabricated in 0.13 μm CMOS technology this LNA exhibits performance including up to 25 dB power gain, 2.23.1 dB noise figure and less than 5 mW power consumption under 1 V power supply.

Original languageEnglish
Article number4668461
Pages (from-to)2754-2763
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
StatePublished - 1 Dec 2008


  • Dual reactive feedback
  • Low-noise amplifier (LNA)
  • Multistandard
  • Reconfigurable
  • Switching inductor

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