SiGe HBT technology and its combination with dense digital CMOS provides a highly attractive platform for compact integrated mm-wave and THz systems. This talk introduces the architecture of modern SiGe HBTs. Next successful numerical simulation (TCAD) approaches are discussed that can support device design. Then, an industry-standard compact model for advanced SiGe HBTs is built step-by-step, addresses the information needs of circuit designers and process engineers. Examples of comparisons of the various models with measurements are provided and possible pitfalls are discussed. Two case studies are presented that show the application of the various modeling tools to process development, generating PDK models, and technology roadmap generation. Speaker(s): Prof. Michael Schroeter, Virtual: https://events.vtools.ieee.org/m/413285