Title :
A delta-sigma modulator for 1-bit digital switching amplifier [audio power amplifier]
Author :
Ré, Pascal Lo ; Fujimoto, Yoshihisa ; Tani, Hitoshi ; Miyamoto, Masayuki
Author_Institution :
Sharp Corp., Nara, Japan
Abstract :
A delta-sigma modulator for a 1-bit digital switching amplifier is presented. To achieve high SNR and a large input range, a 7th order single-loop single-bit modulator using a feedback comparator was designed. The chip was implemented in a 0.35 μm CMOS process with optional 5 V transistors. The measured SNR is 111 dB and the distortion (THD+N) is 0.0015 %. The normalized maximum allowable input range is 0.89. The chip area is 12.6 mm2 and it draws 60 mA from a 5 V supply.
Keywords :
CMOS integrated circuits; audio-frequency amplifiers; comparators (circuits); delta-sigma modulation; feedback amplifiers; power amplifiers; switching circuits; 0.35 micron; 5 V; 60 mA; CMOS; DSA; audio power amplifier; delta-sigma modulator; digital switching amplifier; feedback comparator; single-loop single-bit modulator; Delta modulation; Digital modulation; Filters; Noise reduction; Noise shaping; Pulse amplifiers; Pulse generation; Pulse width modulation; Signal generators; Space vector pulse width modulation;
Conference_Titel :
Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004
Print_ISBN :
0-7803-8495-4
DOI :
10.1109/CICC.2004.1358769
