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All-digital Phase-locked Loops (ADPLLs)

Even for high-speed high-performance wireless communication systems frequency synthesizers based on all-digital phase-locked loops (ADPLLs) are increasingly interesting. An all-digital im- plementation replaces the voltage controlled oscillator (VCO) of analog or digital PLLs (DPLLs) by a digitally controlled oscillator (DCO), where, instead of a voltage, a digital tuning word controls the output frequency.

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