A novel high-speed latching operation flip-flop (HLO-FF) circuit and its application to a 19-Gb/s decision circuit using a 0.2-/spl mu/m GaAs MESFET

This paper describes a novel high-speed flip-flop circuit named the High-speed Latching Operation Flip-Flop (HLO-FF) for GaAs Low-power Source-Coupled FET Logic (LSCFL). We reveal the high-speed operation mechanism of the HLO-FF using newly proposed analytical propagation delay time expressions. A design methodology for series-gated master slave flip-flops and HLO-FF's based on these expressions is also proposed. A SPICE simulation and the fabrication of two decision IC's confirm the accuracy of our analytical method and the high-speed operation of a HLO-FF decision circuit at 19 Gb/s.<
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