A linear 56Gbaud PAM4 transimpedance amplifier (TIA) and a VCSEL-based driver are presented in this paper. It can meet the requirements of emerging 400G Ethernet. The equalizer technique is both ...

This paper presents a current steering variable gain amplifier (VGA) in SiGe BiCMOS with a gain control circuit and a current mirror with negative feedback to avoid thermal runaway. The gain control ...