A high CMRR BiCMOS active combiner balun

An integrated bipolar differential amplifier was optimized to have maximum common mode rejection ratio (CMRR).This amplifier was then used as combiner and splitter baluns. A prototype was fabricated using a SiGe bipolar technology. Measurements show high CMRR and good agreement with simulations. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1253–1256, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25981