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给出了任意比例系数的加减法运算电路,分析了比例系数与平衡电阻、反馈电阻的关系。目的是探索比例系数任意取值时加减法运算电路构成形式的变化。结论是在输入端电阻平衡时,各加运算输入信号比例系数之和与各减运算输入信号比例系数之和的差值在大于1、小于1或等于1情况下,加减法运算电路还可简化。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;扩大了加减法运算电路的应用范围。
Addition and subtraction arithmetic circuit with arbitrary proportion coefficient is given, and the relationship between proportional coefficient and balance resistance and feedback resistance is analyzed. The purpose is to explore changes in the form of addition and subtraction arithmetic circuits when the scale factor is arbitrarily chosen. The conclusion is that when the input resistance is balanced, the difference between the sum of the scaling factors of each adding operation input signal and the scaling factor of each subtracting input signal is greater than 1, less than 1 or equal to 1, the addition and subtraction arithmetic circuit simplify. The innovative point of the method is that the balance condition of the input resistance of the op amp is transformed into the relationship with the proportional coefficient of the input signal, so that the simplified circuit form can be directly determined; and the application range of the addition and subtraction arithmetic operation circuit is enlarged.