Ishak, S. N., J. Sampe, N. A. Nayan, and Z. Yusoff. “A Fast Digital Phase Frequency Detector With Preset Word Frequency Searching in ADPLL for a UHF RFID Reader”. Engineering, Technology & Applied Science Research, vol. 12, no. 5, Oct. 2022, pp. 9379-87, doi:10.48084/etasr.5202.