Systems and methods of phase-locked loop involving closed-loop, continuous frequency range, auto calibration and/or other features
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United States of America Patent
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Aug 1, 2017
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app pub date -
Jun 19, 2015
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Mar 14, 2013
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Abstract
Systems and methods involving phase-locked-loop (PLL) circuitry are disclosed. In one illustrative implementation, a PLL circuit device may comprise voltage controlled oscillator (VCO) circuitry having a bias signal that sets a frequency range, circuitry that shifts the VCO circuitry to operate in one of the frequency ranges, and other circuitry to compare/calibrate signals and/or set the bias current. According to further implementations, as a function of operation of the circuitry, an operating frequency range of the VCO circuitry may be shifted to a different operating frequency range, and closed-loop, continuous frequency range, auto-calibration or other features may be provided.
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