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    NTHUR > College of Electrical Engineering and Computer Science > Department of Electrical Engineering > EE Conference Papers >  Piecewise-linear phase frequency detector for fast-lock phaselocked loops

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    Title: Piecewise-linear phase frequency detector for fast-lock phaselocked loops
    Authors: Jen-Chieh Chih;Ching-Te Chiu;Jen-Ming Wu;Shuo-Hung Hsu;Yar-Sun Hsu
    Teacher: 吳仁銘
    Date: 2011
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on, Seoul, Pages 1-4
    Keywords: fast-lock
    Abstract: In this paper, a new structure of the nonlinear PFD is proposed to achieve fast lock as well as small output jitter. The proposed Piecewise-Linear PFD has more flexibility than previous designs, since the lock time and the output jitter of the PLL are no longer tradeoffs. When the phase difference of the reference and the feedback signal is larger than π, additional charging or discharging current is injected to the loop filter (LF) to accelerate the lock process. On the other hand, to keep the jitter small, the Piecewise-Linear PFD acts just like the conventional linear PFD while approaching lock. The post-simulation results show that a speedup of 68% can be achieved with comparison to the conventional PLL. Moreover, the jitter is almost the same. The output frequency of the PLL is up to 2.5GHz.
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    Appears in Collections:[Department of Electrical Engineering] EE Conference Papers
    [Design Technology Center ] DTC Conference Papers
    [Institute of Communications Engineering] COM Conference Papers

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