Progress with silicon and silicon germanium (SiGe) based BiCMOS technologies over the past few years has been very impressive. This enables the implementation of traditional microwave and emerging mm-wave applications in silicon. The paper gives an overview of several high-performance ICs that have been implemented in a state-of-the-art BiCMOS technology (QUBiC4). Examples of high-performance ICs are described ranging from basic building blocks for mobile applications to highly integrated receiver and transmitter ICs for applications up to the mm-wave range