This brief presents an auxiliary feed-forward noise cancellation (AFFNC) technique that can be applied to a generic Type-II ring oscillator (RO) PLL. The AFFNC technique uses a stand alone sub-sampling phase detector (SSPD) embedded into an alignment loop to extract and cancel noise from the RO output. Along with AFFNC, which uses one reference edge for noise extraction, a Double Sampled AFFNC (DS-AFFNC) which utilizes both the rising and falling edge of the reference for noise extraction is also presented. By using both the reference edges, higher cancellation bandwidth is achieved in DS-AFFNC. The phase-domain model developed for AFFNC and DS-AFFNC show a 2.9x and 3.9x integrated jitter reduction respectively.

中文翻译：

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通用II型环形振荡器锁相环的辅助前馈噪声消除技术

本简介介绍了一种辅助前馈噪声消除（AFFNC）技术，该技术可以应用于通用的II型环形振荡器（RO）PLL。AFFNC技术使用嵌入到对准环路中的独立子采样相位检测器（SSPD）来从RO输出中提取和消除噪声。除了使用一个参考边进行噪声提取的AFFNC之外，还介绍了一种利用参考的上升沿和下降沿进行噪声提取的双采样AFFNC（DS-AFFNC）。通过使用两个参考边缘，可以在DS-AFFNC中获得更高的消除带宽。为AFFNC和DS-AFFNC开发的相域模型分别显示了2.9x和3.9x的综合抖动减小。