Compact Wideband LNA With Gain and Input Matching Bandwidth Extensions by Transformer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Pei Qin
  • Quan Xue


Original languageEnglish
Article number7955068
Pages (from-to)657-659
Journal / PublicationIEEE Microwave and Wireless Components Letters
Issue number7
Publication statusPublished - Jul 2017


This letter presents a compact wideband low-noise amplifier (LNA) with utilizing the transformers for gain and input matching bandwidth extensions based on the source degeneration topology. The wideband gain response is achieved by using a transformer gate-drain feedback technique to peak the gain at high frequency while the wideband input matching is obtained by employing a new transformer-based input matching network to produce two resonant points separately located at low and high frequencies within the operating band. Implemented in 65-nm CMOS process, the proposed LNA shows a measured peak gain of 10.2 dB with its 3-dB bandwidth ranging from 15.8 to 30.3 GHz and minimum noise figure of 3.3 dB. Taking advantage of the superior compactness from the transformer-based techniques, the LNA occupies very compact chip area of only 0.18 mm², exhibiting as one of the most compact wideband LNAs

Research Area(s)

  • Compact, gate-drain feedback, low-noise amplifier (LNA), transformer, wideband gain response, wideband input matching