A 20-GB S SILICON BIPOLAR 1/4-DEMULTIPLEXER IC/

This paper presents a 20-Gb/s 1:4-demultiplexer for future fiber-optic transmission systems. It uses an 0.4-mum emitter double polysilicon 2 1-GHz f(T) Si bipolar foundry process. This is the highest data rate o f a 1:4-DEMUX reported so far in any technology. The 1:4-DEMUX feature s a tree-type architecture with one frequency divider and a channel sw itch circuit. The circuit design was carefully optimized to achieve hi gh speed and moderate power dissipation. It consumes 1.4 W with a sing le -4.5-V supply.