A Novel Multi-level RF-PWM Method for Selective Harmonic Elimination

doi:10.3969/j.issn.0372-2112.2019.03.011

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A Novel Multi-level RF-PWM Method for Selective Harmonic Elimination

更新时间：2025-07-02

- A Novel Multi-level RF-PWM Method for Selective Harmonic Elimination
- Acta Electronica Sinica Vol. 47, Issue 3, Pages: 591-599(2019)
- 作者机构：
  
  中国人民解放军国防科技大学第六十三研究所,江苏,南京,210007
- 作者简介：
- 基金信息：
  
  Key Program of National Natural Science Foundation of China (No.61631021)
- DOI：10.3969/j.issn.0372-2112.2019.03.011
  CLC： TN787+.2
- Published Online：25 March 2019，
  
  Published：2019
- 稿件说明：
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A Novel Multi-level RF-PWM Method for Selective Harmonic Elimination[J]. Acta Electronica Sinica, 2019, 47(3): 591-599.
DOI：

A Novel Multi-level RF-PWM Method for Selective Harmonic Elimination[J]. Acta Electronica Sinica, 2019, 47(3): 591-599. DOI： 10.3969/j.issn.0372-2112.2019.03.011.

摘要

为消除射频脉宽调制（Radio Frequency Pulse Width Modulation，RF-PWM）的特定谐波，本文提出了一种适用于全数字发信机（All-Digital Transmitters，ADTx）的多电平RF-PWM方法.该方法利用多个自适应门限与相位调制信号实时比较，控制多个子脉冲的脉冲宽度，在基波分量加权之和正比于输入信号包络的前提下，使其特定谐波分量相互抵消.和现有技术相比，该方法可显著降低ADTx的输出滤波要求，提高其宽频段性能.以3次谐波消除为例，本文给出了对应5电平RF-PWM方案，并利用仿真和离线实验证明了该方案的有效性.

Abstract

To eliminate the selective harmonics of radio frequency pulse width modulation (RF-PWM) signals

a novel multi-level RF-PWM method for all-digital transmitters (ADTx) is proposed.This method compares the adaptive thresholds in real-time with the phase modulated signal

and controls the pulsewidth of the corresponding subpulses to make the selected harmonics cancel each other out and keep the weighted superposition of fundamental frequency components proportional to input envelope.Compared with the existing techniques

the proposed method can significantly relax the filtering requirements and improve the wideband performance of the ADTx.For the third harmonic elimination

the corresponding 5-level RF-PWM scheme is presented in this paper.Finally

the proposed scheme is verified by extensive simulations and offline measurements.

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