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A 4.5-GHz 256~511 multi-modulus frequency divider for frequency synthesizers is demonstrated. The proposed frequency divider is based on phase switching technique and cascade of divide-by-2/3 cells, it prevents the presence of control logic gates in the highest frequency division block in order to achieve the highest operation frequency under low power consumption; the division ratio is ranged from...
A 5.5-GHz pulse-swallow multi-modulus frequency divider for delta-sigma fractional-N frequency synthesizers is demonstrated in this paper. The frequency divider is composed of a synchronous current mode logic (CML) divide-by-4/5 prescaler, an asynchronous CML divide-by-4 divider and a digital programmable A-M counter. The proposed divider is optimized for high frequency and low power operation; the...
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