“…SiGe HBTs are typically combined with CMOS devices in the form of BiCMOS processes, which are offered by various vendors including IHP [26], ST [29], Tower Semiconductor [30], or Globalfoundries [31]. As a consequence, complex RF and millimeter-wave systems, such as transceivers for communication and radar systems up into the THz range, can be realized, as outlined in Sections III and IV.…”