A capacitor cross-coupled common-gate low-noise amplifier

W. Zhuo, X. Li, S. Shekhar, S.H.K. Embabi, J. Pineda de Gyvez, D.J. Allstot, E. Sanchez-Sinencio

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Abstract

The conventional common-gate low-noise amplifier (CGLNA) exhibits a relatively high noise figure (NF) at low operating frequencies relative to the MOSFET fT, which has limited its adoption notwithstanding its superior linearity, input matching, and stability compared to the inductively degenerated common-source LNA (CSLNA). A capacitor cross-coupled gm-boosting scheme is described that improves the NF and retains the advantages of the CGLNA topology. The technique also enables a significant reduction in current consumption. A fully integrated capacitor cross-coupled CGLNA implemented in 180-nm CMOS validates the gm-boosting technique. It achieves a measured NF of 3.0 dB at 6.0 GHz and consumes only 3.6 mA from 1.8 V; the measured input-referred third-order intercept ( IIP3) value is 11.4 dBm. The capacitor cross-coupled gm-boosted CGLNA is attractive for low-power fully integrated applications in fine-line CMOS technologies.
Original languageEnglish
Pages (from-to)875-879
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume52
Issue number12
DOIs
Publication statusPublished - 2005

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