A 377-416 GHz Push-Push Frequency Doubler with Driving Stage and Transformer-Based Mode Separation in SiGe BiCMOS. - Justin Romstadt; Tobias Welling; Florian Vogelsang; Muhammed Ali Yildirim; Klaus Aufinger; Nils Pohl (BCICTS, 2023)

A 117.5-155-GHz SiGe ×12 Frequency Multiplier Chain With Push-Push Doublers and a Gilbert Cell-Based Tripler. - Justin Romstadt; Ahmad Zaben; Hakan Papurcu; Pascal Stadler; Tobias Welling; Klaus Aufinger; Nils Pohl (IEEE J. Solid State Circuits, 2023)

An E-Band Quadrupler Utilizing a 45°Polyphase Filter for Improved Harmonic Rejection. - Pascal Stadler; Justin Romstadt; Muhammed Ali Yildirim; Tobias Welling; Klaus Aufinger; Nils Pohl (RWS, 2025)