抄録
It is recommended that quality engineering approaches be applied to electrical field. However,some applications indicated the reproducibility of gain is not good enough. The authors have been studying this problem from various viewpoints, and published a paper entitled "Design for the Stabilization of an Amplifier" in Quality Engineering Forum, Vol.4, No.3. ln the study,it was clarified that the characteristics of the measuring device, setting of the signal factor, and setting of the control factors from the cercuit elements affected SN ratio. In this study, a new amplifier was designed considering the above mentioned points. However, it was very difficult to stabilize the circuit having each circuit element as control factors together with transistors of their operationg ranges. Beside the problems in the measuring device, circuit elements and the signal factor, it was clarified that the wiring of circuit elements was also important. Those numerous problems intertwine in a complex form and that the reason why the reproducibility of gain is not satisfactory.
