High speed 8:1 multiplexer and 1:8 demultiplexer implanted with AlGaAs/GaAs HBTs

Abstract

Development of an 8:1 multiplexer and 1:8 demultiplexer implemented with AlGaAs/GaAs heterojunction bipolar transistors is reported. The circuits were designed for lightwave communications and operate at data rates above 6 Gbit/s. The intrinsic speed of the circuits can be further increased by design changes with more power allocated per gate and better time matching at the high-speed ends. The circuit design, fabrication, and test results are presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>