WASET
    Ahmed El Oualkadi and  Abdellah Ait Ouahman,  Hardware Description Language Design of Σ-Δ Fractional-N Phase-Locked Loop for Wireless Applications.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2009, vol. 28(4). 978 - 985
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/13048.