Integrated robust design method based on maximum tolerance region

Traditionally, parameter design is carried out prior to tolerance design. However, this two-step design strategy cannot guarantee optimal robustness for products' quality. The proposed integrated robust design method determined the optimal parameter and tolerance simultaneously by calculating the maximum tolerance region, thereby improving the quality of products. In addition, the proposed method did not need uncertainty analysis to obtain the maximum tolerance region, so that the calculation cost could be decreased. And the method avoided the difficulty of gaining cost-tolerance function as maximum tolerance region represented both demand of cost and robust. Finally, an amplifier circuit case was conducted for verification purpose. Based on the results, the proposed approach could provide robust solution with optimal maximum tolerance region.