Active frequency multiplier by 8 mmic in SiGe HBT technology

Generation of low phase noise RF signals is crucial for a range of applications including communication systems and radars. Doppler radar is a type of radar that estimate the velocity of object by the help of Doppler effect. Slow moving objects causes small Doppler shifts relative to the fast moving objects in reflected signal's frequency. Thus resolvability of the radar is directly related to phase noise of signals. This thesis focuses on the design of low phase noise active frequency multiplier by 8 in SiGe HBT technology. Multiplier core consists three cascaded mixers which are used as a frequency doubler. The mixer topology used in this thesis is the Gilbert mixer, one of the most popular mixer topologies in the literature. This thesis also covers the design of automatic gain control loop which is used to ensure constant output power for various input power conditions.