Journal of Xidian University ›› 2018, Vol. 45 ›› Issue (6): 86-91.doi: 10.3969/j.issn.1001-2400.2018.06.015

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Fast and high-resolution VCO frequency calibration technique

CAI Qingsong1,2;YANG Zhong1,2;JIA Xiaoyun1,2;QIAO Shushan1,2;FAN Xiaohua1,2   

  1. (1. Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China;
    2. School of Electronic, Electrical and Comm. Eng., Univ. of Chinese Academy of Sciences Beijing, 100049)
  • Received:2017-12-26 Online:2018-12-20 Published:2018-12-20

Abstract: A frequency calibration technique with the hybrid calibration process is proposed to reduce the calibration time of the voltage-controlled oscillator (VCO) and maintain the fine calibration resolution. The calibration technique begins by employing the relative frequency comparison method to discern and decrease the difference between the frequency tuning curve and the target frequency. When the frequency tuning curve is close to the target frequency, the calibration technique changes to utilize the frequency error detection method to achieve a fine calibration resolution. With the fast relative frequency comparison process and the high-accuracy frequency error detection process, the calibration time for a frequency resolution of 2MHz is only 2.77μs. Compared to the conventional binary searcher process by only employing the frequency error detection method, the proposed technique saves 31% of the calibration time under the same calibration resolution. Furthermore, this calibration technique is suitable for the wideband fractional-N frequency synthesizer.

Key words: voltage controlled oscillator frequency calibration, hybrid calibration process, calibration resolution, calibration time, frequency synthesizer

CLC Number: 

  • TN911.8

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