Analysis of Offset Spurs in Phase-Locked-Loops Employing Harmonic-Mixer-Based Feedback With Sample-and-Hold Operation

Analysis of Offset Spurs in Phase-Locked-Loops Employing Harmonic-Mixer-Based Feedback With Sample-and-Hold Operation
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采用基于谐波混频器的反馈和采样保持操作的锁相环中的偏移杂散分析

DOI:
10.1109/tcsi.2022.3206837
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发表时间:
2022
期刊:
IEEE Transactions on Circuits and Systems I: Regular Papers
影响因子:
--
通讯作者:
Iizuka Tetsuya
Iizuka Tetsuya
中科院分区:
--
文献类型:
--
作者:
Osada Masaru;Xu Zule;Shibata Ryoya;Iizuka Tetsuya

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分数N锁相环采用基于谐波混频器(HM)的反馈,提供良好的相位噪声和杂散性能,而无需依赖复杂的校准方案。现有技术中的HM通常使用采样保持(S/H)操作来实现。然而,这可能会由于互调而导致不需要的音调,必须使用适当设计的滤波器来抑制。本文提出了一个简单而准确的分析这些音调的位置和大小。我们还提供了一个设计准则的HM基于此分析,以适当地抑制这些音。通过行为和晶体管级仿真的结果支持。
Fractional-N phase-locked loops using Harmonic-Mixer (HM) based feedback offer good phase noise and spur performance without relying on complex calibration schemes. The HMs in prior art are often realized using the Sample-and-Hold (S/H) operation. This, however, can result in unwanted tones due to intermodulation, which must be suppressed using properly-designed filters. This paper proposes a simple and accurate analysis of the location and magnitude of these tones. We also provide a design guideline for the HM based on this analysis to properly suppress these tones. The results are supported through behavioral and transistor-level simulations.
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