A 5.1-GHz 1.9-mW GaAs binary frequency divider

A GaAs divide-by-two circuit operating at a clock rate of 5.1 GHz and dissipating only 1.9 mW has been demonstrated. This represents the best room-temperature speed-power performance yet reported for any flip-flop. The D-type flip-flop owes its high performance to a 0.5- mu m TiWN self-aligned gate fabrication process using low-capacitance dielectric material. The speed-power performance with this process is compared to other recent results for high-speed frequency dividers.>