An ultra-fast and high-precision VCO frequency calibration technique for fractional-N frequency synthesizers

DOI Web Site 被引用文献1件 参考文献20件
  • Liu Qi
    Institute of Microelectronics, the Chinese Academy of Science University of Chinese Academy of Sciences
  • Gan Yebing
    Institute of Microelectronics, the Chinese Academy of Science
  • Ye Tianchun
    Institute of Microelectronics, the Chinese Academy of Science

抄録

<p>A novel VCO auto frequency calibration (AFC) technique is presented in this paper. It provides ultra-fast and high-precision search for an optimum VCO discrete tuning curve among a group of frequency sub-bands in the PLL frequency synthesizer. The calibration circuit consists of a table of frequency (TOF) and a finite state machine (FSM). Asynchronous work of TOF and FSM makes it possible to realize ultra-fast and high-precision calibration simultaneously. TOF affords the high-precision of the calibration and FSM with a high-speed clock offers the ultra-fast search. A 2.8 G–3.5 GHz Fractional-N PLL incorporating the proposed calibration technique is implemented in 55 nm CMOS process. The measured calibration time for a 5-bit capacitor bank is 90 ns for a frequency resolution of 203 KHz. Such small calibration time significantly reduces the effects of calibration time on the total lock time of the PLL.</p>

収録刊行物

  • IEICE Electronics Express

    IEICE Electronics Express 17 (7), 20200066-20200066, 2020

    一般社団法人 電子情報通信学会

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