A 34–110 GHz wideband, asymmetric, broadside-coupled Marchand balun in 180 nm SiGe BiCMOS technology

An asymmetric, broadside-coupled Marchand balun for wideband millimeter wave applications is presented. The balun based on the modified off-center frequency method achieves 34–110 GHz operation bandwidth and exhibits minimum insertion loss of 4.7 dB at 54 GHz. To the author's best knowledge, this is the widest operational bandwidth among the recently published millimeter wave baluns in silicon technology.