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DIGITAL FRACTIONAL-N PLL BASED UPON RING OSCILLATOR DELTA-SIGMA FREQUENCY CONVERSION
DIGITAL FRACTIONAL-N PLL BASED UPON RING OSCILLATOR DELTA-SIGMA FREQUENCY CONVERSION
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机译:基于数字分数-N PLL的环形振荡器DELTA-SIGMA频率转换
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摘要
A frequency-to-digital-converter based PLL (FDC-PLL) that implements the functionality of a charge pump and analog-to-digital converter (ADC) with a dual-mode ring oscillator (DMRO) and digital logic. Preferred embodiments of the invention include circuit-level techniques that provide better spurious tone performance and very low phase noise with lower power dissipation and supply voltage than prior digital PLLs known to the inventors
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