对于该混频器理论研究，包括非线性电路模型及三端器件混频器的设计方法方面都是必要的尝试，可为以后的理论探讨提供重要的经验。
The study about the mixer including nonlinear circuit model and the analysis method is necessary attempt. All of that can provide important experience for later research on it.
日光灯电路是一个非线性电路，而我们上电工课做这个实验时，常把它当成线性电路并采用线性理论来分析它。
While we are having the electrotechnics classes, we usually take it as a linear circuit, and analyse it with the theory of linear circuit.
选定混频器电路拓朴后，应用非线性电路的分析理论对混频器进行了优化。
After selected the topology of the mixer, using nonlinear circuit analysis theory we simulate and optimize the mixer circuit.
选定混频器电路拓朴后，应用非线性电路的分析理论对混频器进行了优化。
After selected the topology of the mixer, using nonlinear circuit analysis theory we simulate and optimize the mixer circuit.
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