Design and implementation of a broad-band high gain low noise amplifier for 3G/4G applications

Ahmed M. Abdelmonem, Ahmed S. I. Amar, Amir Almslmany, Ibrahim L. Abdalla, Fathi A. Farag

Abstract


The main aim of the paper is designing and implementing a broadband low-noise-amplifier (LNA) based on compensated matching network techniquein order to get high stable gain, low noise figure, low cost and smaller sizefor 3G/4G communication system applications at 2 GHz with bandwidth 600MHz. The Advanced Design System simulates the proposed circuit (ADS).The implementation was done with a class A bias circuit and a low noise transistor BFU 730F with a lower Noise Figure (NFmin) 0.62 dB. Collectorcurrent is measured to be 5.8mA and base current is 19.1μA with a supply voltage of 2.25V. The new design proposed a (NFmin) of 0.62 dB with a 17.8dB high stable amplifier gain. The microstrip lines (MSL) and compensated matching network techniques were used to improve the LNA’s stability and achieve a good result. The LNA board is implemented and assembled on the FR4 botton layer material. The results are virtually non existence equivalent between the simulated and the measured results.

Keywords


3G/4G; Compensated matching network; High stable gain; Low cost; Low noise amplifier

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DOI: http://doi.org/10.11591/ijeecs.v23.i2.pp725-732

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