This paper introduces the application of compact modeling for the automatic design of RF/analog wireless communications building blocks. The need for attaining ever more stringent specifications makes imperious the use of optimization-based techniques. Market competiveness makes design time a major concern, rendering analytical based optimization methodologies a preferable solution to be adopted. Thus accurate compact models for both active and reactive elements must be used as a way of obtaining RF building blocks' analytical characterizations to be integrated into the optimization design process.