Realization Study of Class D Power Amplifier by Sigma-Delta Modulation

Author

Hsieh, Guan-Chyun ; Chen, Hung-Liang ; Liu, Pane-You

Author_Institution

Department of Electrical Engineering, Tung Nan Institute of Technology, Taipei, Taiwan 222, ROC, gchsieh@mail.tnit.edu.tw

Volume

2

fYear

2005

Firstpage

1429

Lastpage

1434

Abstract

A class D power amplifier by sigma-delta modulation (SDM) is proposed. Cycle-by-cycle control technique is adopted in converting an analog signal into a digital form. The pulse period generated from SDM is achieved by a discharging/charging process. The SDM pulse length is subject to the detected input level and is composed of a multiple of constant sampling period. Signal process and system model for processing conversion through the SDM modulator is clearly explored. A prototype of 100W class D power amplifier is examined for assessing the theoretical investigation and practicality. The total harmonic distortion (THD) measured without EMI filter is less than 2%.

Keywords

class D; power amplifier; sigma-delta modulation; Delta-sigma modulation; Distortion measurement; Power amplifiers; Power system modeling; Prototypes; Pulse amplifiers; Pulse generation; Signal processing; Signal sampling; Total harmonic distortion; class D; power amplifier; sigma-delta modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Drives Systems, 2005. PEDS 2005. International Conference on

Print_ISBN

0-7803-9296-5

Type

conf

DOI

10.1109/PEDS.2005.1619913

Filename

1619913