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A 20 GHz 8 bit multiplexer IC implemented with 0.5 μm WNx /W-gate GaAs MESFET's

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9 Author(s)
Seshita, T. ; Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan ; Ikeda, Y. ; Wakimoto, H. ; Ishida, K.
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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 μm WNx/W-gate GaAs MESFET process based on optical lithography, ion implantation, and furnace annealing for good reproducibility and high throughput. The WNx/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

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Solid-State Circuits, IEEE Journal of  (Volume:29 ,  Issue: 12 )