Comparison of wideband LNA designs for SDR applications

Anwar Faizd Osman, N. Mohd Noh, M. T. Mustaffa, Asrulnizam Abd Manaf
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引用次数: 2

Abstract

This paper describes the design of two wideband LNA topologies for TIA-603 software defined radio (SDR) applications. The two LNA designs are the negative feedback and the balanced amplifier. The negative feedback employs the resistive drain to gate feedback whereas the balanced amplifier incorporates a compact 3dB branch line coupler. Both designs utilized the GaAs transistor, operated by a 5V DC supply and were implemented in a RO4003 PCB. Comparing the performance of the two designs, the balanced amplifier achieved the best RF performance with a stable gain of at least 17.5dB, noise figure lower than 1.03dB, input and output return loss of greater than 11dB and IIP3 of at least 14dBm, which makes it comparable to previously published works.
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SDR应用的宽带LNA设计比较
本文介绍了TIA-603软件定义无线电(SDR)应用的两种宽带LNA拓扑的设计。两种LNA设计分别是负反馈和平衡放大器。负反馈采用阻性漏极到门反馈,而平衡放大器采用紧凑的3dB分支线耦合器。这两种设计都使用了GaAs晶体管,由5V直流电源操作,并在RO4003 PCB中实现。对比两种设计的性能,平衡放大器实现了最佳的射频性能,稳定增益至少为17.5dB,噪声系数低于1.03dB,输入输出回波损耗大于11dB, IIP3至少为14dBm,与先前发表的作品相当。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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