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J Electromagn Eng Sci > Volume 7(2); 2007 > Article
Journal of the Korean Institute of Electromagnetic and Science 2007;7(2):91-95.
DOI: https://doi.org/10.5515/JKIEES.2007.7.2.091   
Improving the Linearity of CMOS LNA Using the Post IM3 Compensator
Jin-Gook Kim1, Chang-Joon Park2, Hui-Jung Kim3, Bum-Man Kim2, Young-Sik Kim1
1Department of Information and Technology, Handong Golbal University
2Department of Electrical Engineering, Pohang University of School and Technology
3Samsung Electronics
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.
Key words: Low Noise Amplifier, Post-IM3 Compensator, Linearity, IIP3

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