New Dual-band Variable Gain Low Noise Amplifier

CHEN Diping, JIANG Guangcheng, MA Jun

Abstract

This paper proposed a dual-band variable gain low noise amplifier (DBVG-LNA) by using SMIC 0. 13 jjim RF CMOS process. The DBVG-LNA can be used in GSM900/DCS1800 dual-band wireless networking communication system. The multi-resonance network and switching resonant network are used respectively to achieve the input and output dual-band impedance matching. The common gate bypass transistor and switching resistance are used to obtain four variable gains, effectively solving the problem where the variable band and variable gain are incompatible. In addition, a cascode differential topology was used to get a high isolation and a low second harmonic distortion. With a supply power of 1.2 V, the layout are-a of the circuit is 0. 43 m x O. 65m. The simulation results show that when the voltage gain range is 20. 6 —12. 7 dB. NF is 1. 45~2. 05 dB in GSM900 band, while when the voltage gain range is 19. 3~11. 2 dB, NF is 1. 36~2. 55 dB in DCS1800 band. Moreover, both Sn are below —17 dB

 

 

Keywords: low noise amplifier, dual-band,  variable gain, impedance matching


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References


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