A noninverting input scaling circuit with random scaling coefficient is given in this paper.The relationships of scaling coefficient with balance resistor and feedback resistor are analyzed.The purpose of paper is to explore the variation of composition forms of in-phase scaling operation circuit when the scaling coefficient is arbitrary.It's concluded that when the resistance is equilibrium in the input port and input signal scaling coefficients are greater than 1, equal to 1 and less than 1,noninverting input scaling operation circuit can be simplified.The innovation of this method is that the balance condition of input resistance in operational circuits is converted to the scaling coefficients so that the form of simplified circuit can be directly determined.The application scope of noninverting input scaling operation circuits is extended.%给出了任意比例系数的同相比例运算电路,分析了比例系数与平衡电阻、反馈电阻的关系.探索了比例系数任意取值时同相比例运算电路构成形式的变化.在输入端电阻平衡时,输入信号比例系数在大于1、小于1及等于1情况下,同相比例运算电路还可简化.所述方法的创新点是将运放输入端电阻的平衡条件转化为与输入信号比例系数的关系,从而可直观确定简化电路形式,扩大了同相比例运算电路的应用范围.
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