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Design of a new clock recovery ADPLL for disk drives

In this paper, a new all-digital type clock recovery phase locked loop (CRPLL) for disk drives is proposed. The proposed CRPLL can provide both large lock-in range and good tracking performance by estimating the frequency offset and the phase error. Furthermore, it does not suffer severely from the phase jitter due to the quantization effect of the numerically controlled oscillator (NCO). Various simulation and experimental results as well as some mathematical performance analysis are presented to demonstrate the practical use and the excellent performance of the proposed CRPLL over the conventional ones.