Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Improving the Linearity of CMOS LNA Using the Post IM3 Compensator

  • Kim, Jin-Gook (Department of Information and Technology, Handong Golbal University) ;
  • Park, Chang-Joon (Department of Electrical Engineering, Pohang University of School and Technology) ;
  • Kim, Hui-Jung (Samsung Electronics) ;
  • Kim, Bum-Man (Department of Electrical Engineering, Pohang University of School and Technology) ;
  • Kim, Young-Sik (Department of Information and Technology, Handong Golbal University)
  • Published : 2007.06.30
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Abstract

In this paper, a new linearization method has been proposed for a CMOS low noise amplifier(LNA) using the Post IM3 Compensator. The fundamental operating theory of the proposed method is to cancel the IM3 components of the LNA output signal by generating another IM3 components, which are out-phase with respect to that of the LNA, from the Post IM3 Compensator. A single stage common-source LNA has been designed to verify the linearity improvement of the proposed method through $0.13{\mu}m$ RF CMOS process for WiBro system. The designed LNA achieves +7.8 dBm of input-referred 3^{rd}$-order intercept point (IIP3) with 13.2 dB of Power Gain, 1.3 dB of noise figure and 5.7mA @1.5V power consumption. IIP3 is compared with a conventional single stage common-source LNA, and it shows IIP3 is increased by +12.5 dB without degrading other features such as gain and noise figure.

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References

  1. V. Aparin, L. E. Larson, 'Modified derivative superposition method for linearizing FET low-noise amplifiers', IEEE Trans. Microwave Theory and Techniques, vol. 53, no. 2, pp. 571-581, Feb. 2005 https://doi.org/10.1109/TMTT.2004.840635
  2. N. Kim, V. Aparin, 'A cellular-band CDMA 0.25-{\mu}m$ CMOS LNA linearized using active post-distortion', IEEE J. Solid-State Circuits, vol. 41, no. 7, Jul. 2006