Analog Design and Simulation using OrCAD Capture and PSpice

Chapter 11. Worst Case Analysis

Chapter Outline

11.1. Sensitivity Analysis147

11.2. Worst Case Analysis149

11.3. Adding Tolerances150

11.4. Collating Functions150

11.5. Exercise151

Worst case analysis is used to identify the most critical components that will affect circuit performance. Initially, a sensitivity analysis is run on each individual component that has a tolerance assigned. The component value is effectively pushed towards both of its tolerance limits by a small percentage of its value to see which limit would have a greater effect on the worst case output. A worst case analysis is then performed by setting all the component values to their end tolerance limits which gave an indication of the worst case results. In order to reduce the number ...