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短波接收机前端中频镜频高抑制比电路设计

更新时间:2020-07-23 14:36:45 大小:287K 上传用户:xiaohei1810查看TA发布的资源 标签:短波接收机 下载积分:5分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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针对镜频和中频干扰对接收机性能影响的问题,分析了其原因并给出解决方案,设计了跟踪选频滤波器、逆切比雪夫陷波滤波器、5阶巴特沃斯低通滤波器,以及低噪声放大器的三级滤波方式所组成的短波接收机前端滤波放大电路,使短波接收机的中频、镜频抑制比均大于90 d B,接收机的性能得到较大提高。

The impact of IF( intermediate frequency) and image frequency interference on the receiver was discussed. Then the causes were analyzed and the solutions were given. The LNA( low noise amplifier) was designed. Three filtering methods were proposed for the shortwave receiver front- end filter amplifier circuit with tracking frequency selective filter,reverse Chebyshev notch filter,and 5- order Butterworth low- pass filter. The IF and image frequency rejection ratio of shortwave receiver were both realized to be greater than 90 d B.

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短波接收机前端中频、镜频高抑制比电路设计.pdf 287K

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