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 J Electromagn Eng Sci > Volume 14(2); 2014 > Article
 Journal of Electromagnetic Engineering and Science 2014;14(2):47-53. DOI: https://doi.org/10.5515/JKIEES.2014.14.2.47
 A High Gain and High Harmonic Rejection LNA Using High Q Series Resonance Technique for SDR Receiver Byungjoon Kim, Duksoo Kim, Sangwook Nam School of Electrical Engineering and Computer Science, Institute of New Media and Communications, Seoul National University Abstract This paper presents a high gain and high harmonic rejection low-noise amplifier (LNA) for software-defined radio receiver. This LNA exploits the high quality factor (Q) series resonance technique. High Q series resonance can amplify the in-band signal voltage and attenuate the out-band signals. This is achieved by a source impedance transformation. This technique does not consume power and can easily support multiband operation. The chip is fabricated in a $0.13-{mu}m$ CMOS. It supports four bands (640, 710, 830, and 1,070MHz). The measured forward gain ($S_{21}$) is between 12.1 and 17.4 dB and the noise figure is between 2.7 and 3.3 dB. The IIP3 measures between -5.7 and -10.8 dBm, and the third harmonic rejection ratios are more than 30 dB. The LNA consumes 9.6 mW from a 1.2-V supply. Key words: High Gain, High Harmonic Rejection, High Quality Factor Series Resonance, Impedance Transformation, SDR
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