| A High Gain and High Harmonic Rejection LNA Using High Q Series Resonance Technique for SDR Receiver |
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Byungjoon Kim, Duksoo Kim, Sangwook Nam |
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School of Electrical Engineering and Computer Science, Institute of New Media and Communications, Seoul National University |
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| Abstract |
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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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