Silicon-germanium (SiGe) heterojunction bipolar transistor (HBT) BiCMOS technology has established a strong foothold in the communications marketplace by offering a cost competitive solution for a myriad of products. SiGe BiCMOS technologies currently address various applications ranging from 0.9-77 GHz. At the heart of this success is the ease of integration of a high performance SiGe HBT with state-of-the-art CMOS and passive elements. We present the advances in SiGe BiCMOS technologies and an outlook of future challenges and opportunities.