Read full paper at： http://www.scirp.org/journal/PaperInformation.aspx?PaperID=49254#.VJDxq8nQrzE Author(s) Binghua Huang , Xiaoyang He Affiliation(s) Electrical Engineering School, Guangxi University, Nanning, China . Electrical Engineering School, Guangxi University, Nanning, China . ABSTRACT The main harmonic components in nonlinear differential equations can be solved by using the harmonic balance principle. The nonlinear coupling relation among various harmonics can be found by balance theorem of frequency domain. The superhet receiver circuits which are described by nonlinear differential equation of comprising even degree terms include three main harmonic components: the difference frequency and tw...
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