Title :
Implementation of a full digital amplifier using feedback quantization
Author :
Hu, Jwu-Sheng ; Chen, Keng-Yuan
Abstract :
An audio-band full digital amplifier is presented using a low-pass sigma-delta modulator. The modulator is a nonlinear feedback system which outputs a sequence to control the power MOSFET. By rigorous analysis of the stability and performance, an effective design method can be derived. This paper presents the modulator design using both 1- and 1.5-bit quantizer. The designs are successfully implemented by using an FPGA and other discrete elements. Experimental results and comparison are shown by driving the loudspeaker load
Keywords :
audio-frequency amplifiers; circuit feedback; nonlinear systems; power MOSFET; power amplifiers; sigma-delta modulation; FPGA; digital amplifier; discrete elements; feedback quantization; loudspeaker; low-pass sigma-delta modulator; nonlinear feedback system; power MOSFET; Control systems; Delta-sigma modulation; Digital modulation; MOSFET circuits; Nonlinear control systems; Output feedback; Performance analysis; Power MOSFET; Quantization; Stability analysis;
Conference_Titel :
American Control Conference, 2006
Conference_Location :
Minneapolis, MN
Print_ISBN :
1-4244-0209-3
Electronic_ISBN :
1-4244-0209-3
DOI :
10.1109/ACC.2006.1656641
