Linear and Pseudolinear Enhanced Phased-Locked Loop (EPLL) Structures
Linear and Pseudolinear Enhanced Phased-Locked Loop (EPLL) Structures
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DOI：
10.1109/tie.2013.2261035
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发表时间：
2014-03
影响因子：
7.7
通讯作者：
M. Karimi-Ghartemani
中科院分区：
文献类型：
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作者：
M. Karimi-Ghartemani
在本文中，增强型锁相环（EPLL）的修改，以实现线性时不变（LTI）和伪线性（PL）EPLL称为LTI-EPLL和PL-EPLL，分别。修改是基于使用估计的幅度，使EPLL操作独立于输入信号幅度。LTI-EPLL是输入-输出LTI，其输入-输出关系由传递函数表示，这是任何其他类型的现有PLL结构都不可能实现的表示。具有传递函数表示对于设计和分析目的是非常有用的。PL-EPLL将频率自适应引入LTI-EPLL，不再是LTI，但其性能仍然与输入信号幅度无关。传递函数方法还有助于开发和设计各种EPLL扩展，以估计和抑制直流分量和谐波，以及具有宽带噪声受控衰减的扩展。本文对这些问题进行了讨论。该演示文稿的重点是单相EPLL，但扩展到三相PLL也简要介绍。
In this paper, the enhanced phase-locked loop (EPLL) is modified to achieve a linear time invariant (LTI) and a pseudolinear (PL) EPLL called the LTI-EPLL and the PL-EPLL, respectively. The modification is based on using the estimated amplitude to make the EPLL operation independent from the input signal magnitude. The LTI-EPLL is input-output LTI, and its input-output relationship is represented by a transfer function, a representation that has not been possible for any other type of existing PLL structures. Having a transfer function representation is very useful for design and analysis purposes. The PL-EPLL introduces frequency adaptivity into the LTI-EPLL and is no longer LTI, but its performance is still independent from the input signal magnitude. The transfer function approach also facilitates the development and design of various EPLL extensions to estimate and reject the dc component and the harmonics as well as the extension with controlled attenuation of wideband noises. These topics are discussed in this paper. The presentation is focused on single-phase EPLL, but extension to three-phase PLLs is also briefly presented.