Title :
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
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;
Conference_Titel :
Power Electronics and Drives Systems, 2005. PEDS 2005. International Conference on
Print_ISBN :
0-7803-9296-5
DOI :
10.1109/PEDS.2005.1619913
