镜像频率抑制度对射频前端噪声系数的影响分析
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摘要
探讨了镜频抑制度对于射频前端噪声系数的影响,分析计算了一次变频系统中有镜频抑制滤波器和无镜频抑制滤波器两种情况下射频前端输出的噪声功率值,分析表明镜频抑制滤波器在一次变频系统中能够改善系统噪声系数约3 d B;针对二次变频系统射频前端的输出噪声功率,分析计算表明当镜频抑制度达到20 d B以上时,镜像频率对射频前端输出噪声的影响很小,近乎可以忽略。给出一种Ka频段二次变频射频前端的实例,测试结果与理论分析一致。
In this paper,the influence of the image frequency rejection on the noise figure of the RF front-end is analyzed. The noise powers in primary down conversion system with or without image frequency rejection are calculated. It is shown that the image frequency rejection can improve the noise figure of the system by about 3 d B in the primary frequency conversion system. For the output noise power of RF front-end,the calculation shows that when the image rejection reaches20 d B or more,the output noise is very small,almost negligible. An example of Ka-band secondary frequency conversion RF front-end is presented. The test results are consistent with the theoretical analysis.
In this paper,the influence of the image frequency rejection on the noise figure of the RF front-end is analyzed. The noise powers in primary down conversion system with or without image frequency rejection are calculated. It is shown that the image frequency rejection can improve the noise figure of the system by about 3 d B in the primary frequency conversion system. For the output noise power of RF front-end,the calculation shows that when the image rejection reaches20 d B or more,the output noise is very small,almost negligible. An example of Ka-band secondary frequency conversion RF front-end is presented. The test results are consistent with the theoretical analysis.
引文
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[4]黄成,蒲璞,文忠锋.噪声系数测试方法研究[J].微电子学,2013,43(6):867-870Huang C,Pu P,Wen Z F.Study on noise figure measurement methods[J].Microelectronics,2013,43(6):867-870
[5]Hsiao H F,Tu C H,Chang D C,et al.Noise figure verification using cold-source and Y-factor technique for amplifier and down-converted mixer[A].Proceedings of Asia-Pacific Microwave Conference[C],2014.901-903
[2]Andee Y,Prouvee J,Graux F,et al.A fast and functional technique for the noise figure measurement of differential amplifiers[A].2014 10th Conference on Ph.D.Research in Microelectronics and Electronics[C],2014.1-4
[3]王勇,孙彪,杨俊.接收机射频前端噪声特性分析[J].舰船电子对抗,2016,39(3):83-85Wang Y,Sun B,Yang J.Analysis of noise characteristics of RF front-end in receiver[J].Shipboard Electronic Countermeasure,2016,39(3):83-85
[4]黄成,蒲璞,文忠锋.噪声系数测试方法研究[J].微电子学,2013,43(6):867-870Huang C,Pu P,Wen Z F.Study on noise figure measurement methods[J].Microelectronics,2013,43(6):867-870
[5]Hsiao H F,Tu C H,Chang D C,et al.Noise figure verification using cold-source and Y-factor technique for amplifier and down-converted mixer[A].Proceedings of Asia-Pacific Microwave Conference[C],2014.901-903