Title :
Ultrahigh-speed heterojunction bipolar transistor multiplexer/demultiplexer ICs
Author :
Kuriyama, Yasuhiko ; Morizuka, Kouhei ; Akagi, Junko ; Asaka, Masayuki ; Tsuda, Kunio ; Obara, Masao
Author_Institution :
Toshiba Res. & Dev. Center, Kawasaki, Japan
fDate :
6/1/1991 12:00:00 AM
Abstract :
High-speed 2-b monolithic integrated multiplexer (MUX) and demultiplexer (DMUX) circuits have been developed using self-aligned AlGaAs/GaAs heterojunction bipolar transistors (HBTs) with improved high-speed performance. Both ICs were designed using emitter-coupled logic. The 2:1 MUX was composed of a D-type flip-flop (D-FF) merging a selector gate and a T-type flip-flop (T-FF). The 1:2 DMUX consisted of two D-FFs driven at a clock of half the rate of the input data. Error-free operation with a pseudorandom pattern was confirmed up to 10 Gb/s. The rise and fall times of the output signals of both ICs were 40 and 25 ps, respectively. HBT frequency dividers were used as inputs for both ICs in order to find the maximum operation speed. Although only a few test patterns were available, the maximum operation speeds of the MUX and DMUX were found to be around 15 and 19 Gb/s, respectively
Keywords :
III-V semiconductors; aluminium compounds; bipolar integrated circuits; emitter-coupled logic; gallium arsenide; heterojunction bipolar transistors; multiplexing equipment; 15 Gbit/s; 19 Gbit/s; 25 ps; 40 ps; AlGaAs-GaAs; D-type flip-flop; III-V semiconductors; T-type flip-flop; emitter-coupled logic; fall time; frequency dividers; heterojunction bipolar transistor multiplexer/demultiplexer ICs; operation speed; output signals; pseudorandom pattern; rise time; selector gate; Circuits; Clocks; Error-free operation; Flip-flops; Frequency conversion; Gallium arsenide; Heterojunction bipolar transistors; Logic design; Merging; Multiplexing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
