在模拟电路故障诊断中,由于元件容差的影响,以及元件变化与输出增量之间的非线性关系,使得实际的诊断过程非常复杂和困难.本文引用广义线性函数的概念,对元件的容差进行类线性处理,并且弱化了元件参数变化和输出增量之间的非线性关系,提出了等效的支路故障值概念.对应用广义线性函数进行故障诊断做了讨论,导出了计及容差情况下的 k 故障诊断模型及最小二乘算法,由此所得的结果具有最优性和无偏性.诊断时采用多激励方法,消除了诊断过程中的等效故障. In the analog circuit fault diagnosis, the actual diagnosis process is very complicated and difficult due to the influence of component tolerance and the non-linear relationship between component variation and output increment.This paper refers to the concept of generalized linear function, Difference is treated linearly, and the nonlinear relationship between component parameter variation and output increment is weakened, and the concept of equivalent branch fault value is put forward.The fault diagnosis using generalized linear function is discussed, Tolerance fault diagnosis model and least square algorithm, the results obtained with optimality and unbiasedness.Diagnostic multi-excitation method to eliminate the equivalent fault in the diagnosis process.