Design of Lange Couplers with local ground references using SiGe BiCMOS technology for mm-Wave applications

SiGe BiCMOS design solutions for Lange Couplers operating in the mm-Wave domain are proposed. Various circuit topologies are designed, fabricated, and experimentally compared in terms of their RF performances. Effect of grounding strategies and influence of DTI pattering are studied both for CPS and CPW topologies to evaluate dependence of obtained RF performances on Die back-side grounding strategies. Perspectives for physics-based broadband equivalent circuit model extraction are proposed for lumped elements implementation of Lange Couplers using custom variation-aware RLC library elements.