A 20 GHz 8 bit multiplexer IC implemented with 0.5 mu m WN(x)/W-gate GaAs MESFET' s

An ultrahigh-speed 8 bit multiplexer (MUX) has been developed for future-generation optical-fiber communication systems having a data rate of 20 Gb/s. This IC was fabricated using a 0.5 mum WN(x)/W-gate GaAs MESFET process based on optical lithography, ion implantation, and furnace annealing for goo...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1994-12, Vol.29 (12), p.1583-1588
Main Authors: Seshita, T, Ikeda, Y, Wakimoto, H, Ishida, K, Terada, T, Matsunaga, T, Suzuki, T, Kitaura, Y, Uchitomi, N
Format: Article
Language:English
Online Access:Get full text
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Summary:An ultrahigh-speed 8 bit multiplexer (MUX) has been developed for future-generation optical-fiber communication systems having a data rate of 20 Gb/s. This IC was fabricated using a 0.5 mum WN(x)/W-gate GaAs MESFET process based on optical lithography, ion implantation, and furnace annealing for good reproducibility and high throughput. The WN(x)/W bilayer gate has a low sheet resistance, improving the circuit high frequency performance. To attain 20 GHz operation, advanced circuit techniques for the source-coupled FET logic (SCFL) were introduced. A cross coupled source-follower (CCSF) was developed mainly for the highest speed buffers to enhance the bandwidth. The first-stage T-type flip-flop was designed with optimization techniques and operated up to 21.1 GHz
ISSN:0018-9200
DOI:10.1109/4.340435