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This paper identifies the unavoidable time skew between counter and TDC inputs, if not properly compensated or corrected, as the major source of spurs in the output spectrum of an All-Digital-Phase-Locked Loops (ADPLLs). The frequency and the level of the main spur induced by the time skew are first analytically estimated. Then, an ADPLL, operating in the 3–4-GHz band, is designed in 90-nm CMOS technology...
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