Chin. J. Semicond. > 2006, Volume 27 > Issue 11 > 1911-1917

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Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers

Liu Junhua, Liao Huailin, Yin Jun, Huang Ru and Zhang Xing

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Abstract: A new coarse tuning loop for a wide-band dual-loop frequency synthesizer is presented.The coarse tuning structure is composed of two digital modules, including a successive approximation register and a frequency comparator with a novel structure.The frequency comparator counts the prescaler cycles within a certain reference time and compares the number with preset data to estimate the VCO frequency.The frequency comparison error is analyzed in detail.Within a given coarse tuning time,our proposed structure shows a comparison error 20 times smaller than that of other reported structures.This structure also reuses the programmable divider as a part of the coarse tuning loop so that the circuit is greatly simplified.

Key words: wide-bandcoarse tuning loopfrequency synthesizervoltage-controlled oscillator

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    Received: 18 August 2015 Revised: Online: Published: 01 November 2006

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      Liu Junhua, Liao Huailin, Yin Jun, Huang Ru, Zhang Xing. Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers[J]. Journal of Semiconductors, 2006, In Press. Liu J H, Liao H L, Yin J, Huang R, Zhang X. Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers[J]. Chin. J. Semicond., 2006, 27(11): 1911.Export: BibTex EndNote
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      Liu Junhua, Liao Huailin, Yin Jun, Huang Ru, Zhang Xing. Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers[J]. Journal of Semiconductors, 2006, In Press.

      Liu J H, Liao H L, Yin J, Huang R, Zhang X. Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers[J]. Chin. J. Semicond., 2006, 27(11): 1911.
      Export: BibTex EndNote

      Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers

      • Received Date: 2015-08-18

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