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The noise performance of an all-digital phase-locked loop (ADPLL) is limited by the resolution of the time-to-digital converter (TDC). Most TDC research in the past focused on the arrival time difference between the edges of the divider feedback and the reference signal [1-2]. This results in coarser TDC resolution and worse ADPLL noise performance. This paper presents a fractional-/VADPLL that employs...
In this paper, a novel circuit topology of CMOS divide-by-three injection-locked frequency divider is demonstrated. By using a differential direct injection pair with a LC-tank oscillator, the proposed circuit can perform the division ratio of three while the wide locking range is obtained. Based on the presented circuit architecture, a V-band frequency divider is implemented in 65-nm CMOS for demonstration...
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