Title :
A high performance class-D power amplifier using error feedback architecture
Author :
Trehan, Chintan ; Chao, Kwong S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Tech Univ., Lubbock, TX
Abstract :
An architecture that enhances the performance of a class-D amplifier is proposed. The structure consists of a sigma-delta modulator (SDM) which converts the input signal to a 1-bit pulse duration modulation signal. The H-bridge driven by this signal is made part of the SDM loop. The feedback is achieved by two different approaches. One consists of a 4-bit SD analog-to-digital converter and the other consists of a SDM in the continuous time (CT) domain. These arrangements enable the shaping of the high frequency in-band noise generated at the output power stage
Keywords :
circuit feedback; circuit noise; power amplifiers; sigma-delta modulation; H-bridge; analog-to-digital converter; class-D power amplifier; continuous time domain; error feedback architecture; high frequency in-band noise; pulse duration modulation signal; sigma-delta modulator; Analog-digital conversion; Delta-sigma modulation; Feedback; Frequency; High power amplifiers; Noise generators; Noise shaping; Power generation; Pulse amplifiers; Pulse modulation;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Conference_Location :
Covington, KY
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594121
