Title :
Class-D audio amplifiers with separated baseband for low-power mobile applications
Author :
Streitenberger, M. ; Felgenhauer, F. ; Bresch, H. ; Mathis, W.
Author_Institution :
Inst. of Electromagn. Theor. & Microwave Eng., Hannover Univ., Germany
Abstract :
In this paper, a digital real-time implementation of a binary zero-position coding concept with separated baseband is presented. This coding concept applies to highly power efficient class-D amplification for use in low-power mobile audio equipment. With its separated baseband, which by theory is free of distortion, this concept enables the design of ultra linear class-D power amplifiers. The implemented coding system has a dynamic range of 70 dB and a separated baseband extending from 0 to 42 kHz with a resulting switching rate of only 97.6 kHz. Theory, implementation considerations and measurement results are discussed.
Keywords :
audio coding; audio-frequency amplifiers; digital integrated circuits; linear network synthesis; low-power electronics; power amplifiers; 0 to 42 kHz; 97.6 kHz; binary zero-position coding; coding system dynamic range; digital real-time implementation; distortion-free separated baseband; low-power mobile applications; low-power mobile audio equipment; power efficient class-D amplification; separated baseband class-D audio amplifiers; switching rate; ultra linear class-D power amplifiers; Baseband; Distortion measurement; Dynamic range; Low pass filters; Power amplifiers; Pulse amplifiers; Pulse width modulation; Signal processing; Signal processing algorithms; Space vector pulse width modulation;
Conference_Titel :
Circuits and Systems for Communications, 2002. Proceedings. ICCSC '02. 1st IEEE International Conference on
Print_ISBN :
5-7422-0260-1
DOI :
10.1109/OCCSC.2002.1029076
