Abstract
A fast-settling all-digital phase-locked loop (ADPLL) is presented in this paper. We propose two techniques for reducing the settling time of an ADPLL, i.e. the oscillator tuning word (OTW) presetting technique and counter-based mode switching controller (CB-MSC). In the first technique, the OTW is preset in process, voltage, and temperature (PVT) calibration mode (P-mode), which leads to the digitally controlled oscillator being initialized with a frequency closer to the target. In the second technique, the CB-MSC is used to shorten the mode switching time. A prototype 1.9 GHz ADPLL with a 13 MHz reference is implemented in 0.18 μm CMOS process. Measurements show that the proposed techniques reduce the settling time by about 33 %. The proposed ADPLL settles within 130 reference cycles and presents a phase noise of −116 dBc/Hz@1 MHz.
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Acknowledgments
This work was supported by the China Postdoctoral Science Foundation funded project under Grant 2012T50091 and Grant 2011M500308, the National Natural Science Foundation of China (NSFC) under Grant 61204032 and Grant 61261160501, 973 program under Grant 2013CB329000, and Tsinghua University Initiative Scientific Research Program.
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Zhao, B., Yu, G., Lian, Y. et al. A 1.9 GHz ADPLL with 130 reference cycles settling time in 0.18 μm CMOS technology. Analog Integr Circ Sig Process 76, 81–89 (2013). https://doi.org/10.1007/s10470-013-0070-6
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DOI: https://doi.org/10.1007/s10470-013-0070-6