Injection-Locked Frequency Dividers based on Ring Oscillators with Optimum Injection for Wide Lock Range
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Divide-by-2 and divide-by-6 ring oscillators use multi-phase injection to operate from near DC to 1.7 and 1.2 GHz input frequencies, respectively. In 0.13-mum CMOS, the circuits consume 0.25 mA per stage
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