| Citation: |
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, 27(11): 1911-1917.
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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.
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Digital Coarse Tuning Loop for Wide-Band Fast-Settling Dual-Loop Frequency Synthesizers
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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. -
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