A new Fractional-N frequency synthesizer using Nested-PLL architecture

Mohammadreza Jamali, Emad Ebrahimi
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引用次数: 1

Abstract

Delta-sigma modulators (DSM) in conventional Fractional-N PLLs produce quantization noise and can't remove fractional spurs around the main frequency well. In order to reduce the spurs in Fractional-N synthesizers, a new Nested-PLL has been presented in this work. The proposed Fractional-N PLL consists of a conventional PLL as a frequency multiplier (*M) in feedback path that make fraction M/N along divider (N). In the other words the fraction M/N is achieved by a Nested-PLL instead of delta-sigma modulator. Therefore, spurs caused by delta-sigma modulator or pulse swallower is removed. The proposed Nested-PLL and its stability issues are addressed in this paper. Also to verify the proposed structure a prototype of the synthesizer with Fref=100MHz and Fout=1GHz–1.3GHz designed and simulated systematically, and no fractional spurs are observed.
采用嵌套锁相环结构的新型分数n频率合成器
传统分数n锁相环中的δ - σ调制器(DSM)产生量化噪声,不能很好地去除主频率周围的分数杂散。为了减少分数n合成器中的杂散,本文提出了一种新的嵌套锁相环。所提出的分数-N锁相环包括一个传统的锁相环作为反馈路径中的频率乘法器(*M),使分数M/N沿着分频器(N)。换句话说,分数M/N是由嵌套锁相环代替delta-sigma调制器实现的。因此,消除了由δ - σ调制器或脉冲吞噬器引起的杂散。本文讨论了所提出的嵌套锁相环及其稳定性问题。为了验证所提出的结构,设计了Fref=100MHz, Fout= 1GHz-1.3GHz的合成器样机并进行了系统仿真,没有观察到分数杂散。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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