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A 90nm buck converter is intended for complex multi-core ICs. Using the 3GHz system clock for switching reduces the area to 0.27mm2 and allows the output filter to be integrated. Efficiency is increased by recycling clock charge and delivering it to the load instead of ground. A dedicated 3GHz clock circuit driving 12pF consumes 39.9mW. In contrast, a combined clock and converter circuit consumes...
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