Jorge Alves Torres João Caldinhas Vaz João Costa Freire 30GHz Amplifiers with 0.25μm SiGe BiCMOS. 578-581 2007 ICECS https://doi.org/10.1109/ICECS.2007.4511057 conf/icecsys/2007 db/conf/icecsys/icecsys2007.html#TorresVF07