Ferrite Bead Effect on Class-D Amplifier Audio Quality

被引：0
|
作者：
El Haddad, Kevin [1 ]
Mrad, Roberto [1 ,2 ]
Morel, Florent [2 ]
Pillonnet, Gael
Vollaire, Christian [2 ]
Nagari, Angelo [1 ]
机构：
[1] ST Microelect, Analog MEMS & Sensors AMS Grp, Grenoble, France
[2] Univ Lyon, Ecole Cent Lyon, Ampere, CNRS UMR5005, F-69134 Ecully, France
来源：
2014 17TH IEEE MEDITERRANEAN ELECTROTECHNICAL CONFERENCE (MELECON) | 2014年
关键词：
Ferrite bead; Magnetic material; Audio frequency band; Harmonics distortion;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper studies the effect of ferrite beads on the audio quality of Class-D audio amplifiers. This latter is a switching circuit which creates high frequency harmonics. Generally, a filter is used at the amplifier output for the sake of electromagnetic compatibility (EMC). So often, in integrated solutions, this filter contains ferrite beads which are magnetic components and present non-linear behavior. Time domain measurements and their equivalence in frequency domain are presented. Total Harmonic Distortion (THD) measurements according to the audio signal frequency and amplitude are exposed and discussed. It is shown that ferrite beads introduce up to 3 0 dB of additional THD which prove the negative effect of the ferrite bead on the amplifier audio quality.
引用
收藏
页码：74 / 78
页数：5
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