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本文应用Volterra泛函级数理论,研究扩大短波通信接收机前端高频通道的动态范围。首先建立了前端高频通道的功能模型和Volterra模型,采用三阶互调截点动态范围指标为目标函数,对前端高频通道指标的优化分配问题进行了研究。在建立晶体管非线性模型的基础上,编制了用Volterra泛函级数法分析放大器非线性失真的通用程序NDAP,并研制了大动态范围的双管并联放大器,进而简述了混频器中信号对本振的相位调制效应,提出了改善混频器线性的方法。研制了高线性的场效应管无源高电平双平衡混频器,最后实现了大动态范围的前端高频通道,通道的噪声系数小于等于5.8dB,三阶互调截点动态范围达到97.9dB。
In this paper, Volterra functional series theory is applied to study the dynamic range of the HF channel at the front end of HF communication receiver. First of all, the functional model and Volterra model of the front-end high-frequency channel are established. Using the third-order intercept point dynamic range index as the objective function, the optimal distribution of the front-end high frequency channel index is studied. Based on the nonlinear model of the transistor, a general program NDAP for analyzing the nonlinear distortion of the amplifier by using the Volterra functional series was developed, and a double-pipe parallel amplifier with large dynamic range was developed. Then the signals in the mixer On the phase modulation effect of the local oscillator, a method of improving the linearity of the mixer is proposed. A high linearity FET passive high-level double-balanced mixer is developed. Finally, a large dynamic range front-end high-frequency channel with a noise figure of less than or equal to 5.8dB and a third-order intermodulation intercept point dynamic range of 97.9 dB.