电压并联负反馈放大电路稳定性的分析与讨论

摘要

推导了适用于反馈系数变化条件下的反馈放大器增益相对稳定性的一般公式.用运算放大器作为基本放大元件,构成电压并联负反馈放大电路,对开环互阻增益和反馈系数变化情况下的闭环互阻增益的相对稳定性进行了分析.结果表明:微分形式仅适用于开环增益变化不大情况；差分形式要求反馈系数不变；而一般形式在电路参数改变的各种情况下都能成立,是一个普遍适用的公式.%A voltage of parallel negative feedback amplifier circuit is designed by using operational amplifier as basic component. The relative stability of mutual resistance gain is analyzed in open-loop and closed-loop circuit when feedback coefficient is changed. The differential form is only suitable for the open-loop gain with little change, the difference form request feedback factor is invariable, but the formulas for relative stability of differential and difference forms have some limitations. Moreover, the general formula established under all conditions when the parameters of circuit are changed is a universal one.