0.2 GHz～3.2 GHz超宽带低噪声放大器的研制

为了降低接收前端的噪声,设计并制作一种超宽带低噪声放大器。基于负反馈技术和宽带匹配技术,利用Avago ATF-54143 PHEMT晶体管设计了放大器电路。运用ADS2009对重要指标进行仿真及优化。实测结果表明,在0.2 GHz～3.2 GHz这4个倍频程的超宽带范围内,增益大于24 dB,增益平坦小于±2 dB。在0.2 GHz～2GHz内,噪声系数（NF）小于1.2 dB;在2 GHz～2.6 GHz内,NF〈1.5 dB;在2.6 GHz～3.2 GHz内,NF〈2 dB。该放大器性能良好,满足工程应用要求,可用于通信系统的接收机前端。

Development of ultra-broad band LNA in 0.2 GHz-3.2 GHz

To reduce the noise of receiving front-ends,the design and fabrication of an ultra-wide band Low Noise Amplifier（LNA）,were presented based on negative feedback and wide band matching technologies.The amplifier tube ATF-54143 made by Avago was chosen for this design,whose key indexes were simulated and optimized by using ADS2009.The test results indicate that the gain is greater than 24 dB;the flatness is lower than ±2 dB over the four octaves 0.2 GHz-3.2 GHz.Noise Figure（NF） is below 1.2 dB over 0.2 GHz-2 GHz;and less than 1.5 dB over 2 GHz-2.6 GHz;less than 2 dB over 2.6 GHz-3.2 GHz.The good performance of this amplifier satisfies the requirement of engineering application,and it can be applied to the receiver front-end of communication systems.