50 Gb/s SiGe BiCMOS 4:1 multiplexer and 1:4 demultiplexer for serial communication systems

Abstract

50 Gb/s SiGe BiCMOS 4:1 multiplexer and 1:4 demultiplexer were discussed for serial communication systems. Serial communication system can fulfil the demand for higher userend bandwidth and higher capacity network. Demultiplexer (DMUX) ICs chips target SONET OC-768 applications and are able to operate error free beyond 50Gb/s. It uses a tree architecture with a recursive series of 1:2 demultiplexer stages. It also uses a half-rate input clock for the first 1:2 demultiplexing stage.