20 Gbit/s AlGaAs/GaAs-HBT 2:1 selector and decision ICs

A 2:1 selector and a decision IC have been fabricated using self-aligned AlGaAs/GaAs HBTs with a 2 mu m*5 mu m emitter having a cutoff frequency of 62 GHz and a maximum oscillation frequency of 108 GHz. Operation exceeding 20 Gbit/s was demonstrated with these ICs in 2:1 multiplexer and 1:2 demultiplexer experiments. >