Observations concerning PFD/CP operating point offset strategies for combatting static charge pump mismatch in fractional-<I>N</I> frequency synthesizers with digital delta-sigma modulators

Michael Peter Kennedy; Vahideh Sedat Sadeghi

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Observations concerning PFD/CP operating point offset strategies for combatting static charge pump mismatch in fractional-N frequency synthesizers with digital delta-sigma modulators

机译：有关在具有数字delta-sigma调制器的分数 N 频率合成器中消除PFD / CP工作点偏移策略的观点，以解决静电荷泵不匹配的问题

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Static charge pump mismatch can cause fractional-N frequency synthesizers to exhibit both an elevated in-band noise floor and in-band spurious tones (spurs). To first order, the transfer characteristic of the phase-frequency detector/charge pump (PFD/CP) is piecewise-linear with two segments. The mismatch-related nonidealities can be alleviated by offsetting the operating point so that the phase excursions at the input to the PFD/CP lie completely within one segment. By considering a simplified two-segment piecewise-linear model of the PFD/CP, we show how a combination of delay and/or current offset can be used to combat mismatch. We illustrate our analysis using a simplified Matlab model and confirm its predictions by simulation using the CppSim behavioral simulator. 展开▼

机译：静电荷泵失配会导致小数N分频频率合成器显示出较高的带内噪声基底和带内杂散音（杂散）。首先，相频检测器/电荷泵（PFD / CP）的传递特性是分段线性的，具有两个部分。通过补偿工作点可以减轻与失配有关的非理想性，从而使PFD / CP输入端的相位偏移完全位于一个段之内。通过考虑PFD / CP的简化的两段分段线性模型，我们展示了如何结合使用延迟和/或电流偏移来解决失配问题。我们使用简化的Matlab模型说明我们的分析，并通过使用CppSim行为模拟器进行仿真来确认其预测。展开▼

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《Nonlinear Theory and Its Applications》 |2014年第3期|共16页

作者
Michael Peter Kennedy; Vahideh Sedat Sadeghi;
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1. A fractional- N frequency synthesizer architecture utilizing a mismatch compensated PFD/DAC structure for reduced quantization-induced phase noise [J] . Meninger S.E., Perrott M.H. IEEE Transactions on Circuits and Systems. II, Express Briefs . 2003,第11期

机译：利用失配补偿PFD / DAC结构的分数N频率合成器架构，可减少量化引起的相位噪声

2. A fractional- N frequency synthesizer architecture utilizing a mismatch compensated PFD/DAC structure for reduced quantization-induced phase noise [J] . Meninger S.E., Perrott M.H. IEEE Transactions on Circuits and Systems. Part 2, Analog and Digital Signal Processing . 2003,第11期

机译：利用失配补偿PFD / DAC结构的分数N频率合成器架构，可减少量化引起的相位噪声

3. 0.3–4.3 GHz Frequency-Accurate Fractional-$N$ Frequency Synthesizer With Integrated VCO and Nested Mixed-Radix Digital $Delta$-$Sigma$ Modulator-Based Divider Controller [J] . Kennedy M.P., Mo H., Fitzgibbon B., Solid-State Circuits, IEEE Journal of . 2014,第7期

机译：具有集成VCO和嵌套混合基数数字$ Delta $-$ Sigma $调制器的分频器控制器的0.3–4.3 GHz频率精确分数-$ N $频率合成器

4. Observations concerning noise floor and spurs caused by static charge pump mismatch in fractional-N frequency synthesizers [C] . Kennedy Michael Peter, Hu Guosheng, Sadeghi Vahideh Sadat 25th IET Irish Signals amp; Systems Conference 2014 amp; 2014 China-Ireland International Conference on Information and Communications Technologies . 2014

机译：关于分数N频率合成器中由静电荷泵不匹配引起的本底噪声和杂散的观察

5. A multi-band fractional-N frequency synthesizer using binary-weighted digital/analog differentiator and offset-frequency delta-sigma modulator for noise and spurs cancellation. [D] . Jian, Heng-Yu. 2009

机译：一种使用二进制加权数字/模拟微分器和失调频率delta-sigma调制器的多频带分数N频率合成器，用于消除噪声和杂散。

6. Observations concerning PFD/CP operating point offset strategies for combatting static charge pump mismatch in fractional-N frequency synthesizers with digital delta-sigma modulators [O] . Michael Peter Kennedy, Vahideh Sedat Sadeghi 2014

机译：关于PFD / CP操作点偏移策略的观察，用于用数字Delta-Sigma调制器对抗分数 - N 频率合成器的静电电荷泵不匹配

1. Synchronous modulated-fully digital delta-sigma modulator circuit for use in fractional N-phase locked loop frequency synthesizer, has digital un-modulated fractional-control signal processing full-digital delta-sigma modulator circuit [P] . 外国专利： DE102011120769A1 . 2013-06-13

机译：用于分数N锁相环频率合成器的同步调制全数字delta-sigma调制器电路，具有数字未调制分数控制信号处理全数字delta-sigma调制器电路

2. Binary-weighted delta-sigma fractional-N frequency synthesizer with digital-to-analog differentiators canceling quantization noise [P] . 外国专利： US8193845B2 . 2012-06-05

机译：具有数模微分器的二元加权delta-sigma分数- N 频率合成器可消除量化噪声

3. Pipelined Bus-Splitting Digital Delta-Sigma Modulator for Fractional-N Frequency Synthesizer System and Method [P] . 外国专利： US2014077843A1 . 2014-03-20

机译：用于分数n频率合成器系统的流水线总线分离数字Δ-Σ调制器系统和方法

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Observations concerning PFD/CP operating point offset strategies for combatting static charge pump mismatch in fractional-N frequency synthesizers with digital delta-sigma modulators

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