1引言故障诊断字典法是模拟电路故障诊断中具有较高实用价值的方法，该法对含一定容差的线性、非线性电路的硬故障有较好诊断能力．其实施步骤包括：故障集与激励信号选择、模糊集划分、节点优选、故障隔离、故障字典建立、根据测试向量诊断故障[1]．其中模糊集划分是字典法实 1 Introduction Fault dictionary method is a diagnostic method of analog circuit fault diagnosis with high practical value, the method with a certain tolerance of linear, nonlinear circuit has a good fault diagnosis of hard faults. The implementation steps include: fault set and excitation signal selection, fuzzy set division, node optimization, fault isolation, fault dictionary establishment, fault diagnosis based on test vectors [1]. Fuzzy set division is the dictionary of law