Citation: |
Song Ying, Wang Yuan, Jia Song, Zhao Baoying. A VCO sub-band selection circuit for fast PLL calibration[J]. Journal of Semiconductors, 2009, 30(8): 085010. doi: 10.1088/1674-4926/30/8/085010
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Song Y, Wang Y, Jia S, Zhao B Y. A VCO sub-band selection circuit for fast PLL calibration[J]. J. Semicond., 2009, 30(8): 085010. doi: 10.1088/1674-4926/30/8/085010.
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Abstract
A novel voltage controlled oscillator (VCO) sub-band selection circuit to achieve fast phase locked loop(PLL) calibration is presented, which reduces the calibration time by measuring the period difference directly and accomplishing an efficient search for an optimum VCO sub-band. The sub-band selection circuit was implementedin a 0.18 µm CMOS logic process with a PLL using an 8 sub-band VCO. The measured calibration time is less than 3 µs in a VCO frequency range from 600 MHz to 2 GHz. The proposed circuit consumes 0.64 mA at most.-
Keywords:
- PLL,
- VCO,
- calibration
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References
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Proportional views