抄録
One of the importants for an amplifier is that the gain of frequency characteristic is flat. But quite ofen, it is not, especially for the amplifiers with a wide range. ln order to make the response flat, a circuit called equalizer is connected to compensate the gain declination. The objectives of this study is to optimize the robustness of the amplifier and find the controlfactors which least affect SN ratio but most affect sensitivity to conduct the tuning so that the gain becomes flat. The least squares method was used to find the solution. ln electriccircuits, it is common that the input , the output and the proportional constant are consisted of complex numbers where both the real and the imaginary numbers are important. ln this study, the analysis method of dealing with complex numbers developed by Dr.Genichi Taguchi was used with a good result.
