InVar IR-drop and Thermal Analysis Silvaco’s InVar® performs IR-drop and thermal analysis on analog and mixed-signal IC designs.Analysis of IR-drop and thermal effects have traditionally been a significant bottleneck in the physical verification of transistor level designs such as analog circuits, high-speed IOs, custom digital blocks, memories and standard cells. This is due to the need for accurate and increasingly complex analysis to be performed on designs that are progressively larger in size. For example, FinFET’s increased current density and thermal profile failure rate probabilities that must be managed with careful analysis and design.