从电荷灵敏前置放大的工作原理入手，通过分析探测器输出等效脉冲序列特点，结合放大器实际工作物理过程，推导出电荷灵敏前置放大器的上限取值，同时给出计数率Ni 与i倍的时间常数的关系及数值分析结果，为设计电荷灵敏前置放大器考虑饱和上限提供理论依据。%The problem of a CSA ( Charge Sensitive Preamplifier ) saturation is an important problem .In the pa-per, starting from the working principle of a CSA , through the analysis of the detector output equivalent pulse sequence characteristics , combined with the actual physical process of a CSA , the upper limit value of CSA is conduced .And at the same time , the relationship between the count rates Ni and the time constant times i and the results of numerical analysis are given , as well as providing the theory basis for the design of a CSA consid-ering the saturation limit .
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