一种用于数字D类功放的伪自然采样算法.pdfVIP

第36 卷第3 期 电 子 与 信 息 学 报 Vol.36 No.3 2014 年3 月 Journal of Electronics Information Technology Mar. 2014 一种用于数字D 类功放的伪自然采样算法 于泽琦* 樊养余 史龙飞 吕国云 (西北工业大学电子信息学院 西安 710129) 摘 要：该文针对均匀采样脉冲宽度调制(UPWM)型数字D 类功放，提出了一种新的伪自然采样算法以校正其在 开关信号调制时产生的谐波失真。该算法融合了三阶和一阶拉格朗日插值法，并结合伪自然采样点位置判断法而形 成，可在计算复杂度较低的同时，达到较好的谐波失真校正效果。该文使用FPGA 搭建了一个基于该算法以及其 它同类算法的开关信号调制器测试系统。测试结果表明，相比同类算法，该算法基本消除了谐波失真且硬件消耗适 中，显示了更大的优越性。 关键词：数字D 类功放；伪自然采样；谐波；拉格朗日插值 中图分类号：TN402 文献标识码： A 文章编号：1009-5896(2014)03-0758-05 DOI: 10.3724/SP.J.1146.2013.00704 A Pseudo Natural Sampling Algorithm for Digital Class D Power Amplifiers Yu Ze-qi Fan Yang-yu Shi Long-fei Lü Guo-yun (School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710129, China) Abstract: A new pseudo natural sampling algorithm is proposed in this paper for correcting the harmonic distortion produced by switching signal modulation in Uniform sampled Pulse Width Modulation (UPWM) digital class D power amplifiers. This algorithm combines the 3th-order and 1st-order Lagrange interpolation methods and adopts a position judging method for pseudo natural sampling point to obtain an expected harmonic distortion correction effect and computation complexity. A switching signal modulator test system based on FPGA is built to test the proposed algorithm and other kindred algorithms. The test results show that the proposed algorithm basically eliminates the harmonic distortion with modest hardware consumption and is better than other kindred algorithms. Key words: Digital class D power amplifier; Pseudo natural sampling; Harmonic; Lagr