0.2 GHz～3.2 GHz超宽带低噪声放大器的研制

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

摘要:

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

Abstract:

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.