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首页> 外文会议>Conference on Ph.D. Research in Microelectronics and Electronics >Phase noise in fractional-N frequency synthesizers employing successive requantizers and MASH-SQ hybrids
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Phase noise in fractional-N frequency synthesizers employing successive requantizers and MASH-SQ hybrids

机译：采用连续重量化器和MASH-SQ混合器的小数N分频合成器中的相位噪声

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Noise-shaping quantizers are used in fractional-N PLLs to provide a fractional-mean modulation signal to the loop divider. A drawback to this method is the introduction of phase noise due to the changing divide ratio. Noise shaping techniques are typically employed, but have been shown to produce spurs in the presence of loop nonlinearities. An alternative to the traditional MASH DΔΣM has been introduced in the form of the Successive Requantizer (SQ), which can offer better spurious performance at the expense of area. The MASH-SQ Hybrid combines both approaches to achieve the performance of the SQ with a much reduced implementation cost. In this paper, we summarise the properties of the SQ and a method for estimating the phase noise introduced, before deriving the minimum number of requantization stages required to mask an input modulation signal, and thus present an expression for the optimum MASH-SQ Hybrid size.
机译：分数N分频PLL中使用了噪声整形量化器，以将分数均值调制信号提供给环路分频器。该方法的缺点是由于分频比的变化而引入相位噪声。通常采用噪声整形技术，但已证明在存在环路非线性的情况下会产生杂散。已经以连续量化器（SQ）的形式引入了传统MASHDΔΣM的替代产品，该替代产品可以提供更好的杂散性能，但会占用面积。 MASH-SQ Hybrid结合了两种方法来实现SQ的性能，并大大降低了实现成本。在本文中，我们总结了SQ的特性以及估算引入的相位噪声的方法，然后得出掩盖输入调制信号所需的最小重新量化级数，从而给出了最佳MASH-SQ Hybrid尺寸的表达式。

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