Title :
PowerDAC: a single-chip audio DAC with a 70%-efficient power stage in 0.5 /spl mu/m CMOS
Author :
Philips, K. ; van den Homberg, J. ; Dijkmans, C.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
Abstract :
The path from digital (audio) input to analog output power normally consists of a D/A converter, a low-pass filter and a class AB amplifier (having low overall power efficiency). Generally this is a two-chip solution with a D/A converter and an amplifier implemented in different technologies. This paper presents a single-chip digital amplifier combining bitstream D/A conversion with a power-efficient switching output stage (class D) without intermediate filtering. The circuit is implemented in 0.5 /spl mu/m standard CMOS technology.
Keywords :
CMOS integrated circuits; Hi-Fi equipment; audio-frequency amplifiers; circuit feedback; digital-analogue conversion; mixed analogue-digital integrated circuits; power amplifiers; switching circuits; 0.5 micron; 1 MHz; 2 W; 5 V; 70 percent; D/A converter; PowerDAC; bitstream D/A conversion; class AB amplifier; class D output stage; digital stereo power amplifier; low-pass filter; power stage; power-efficient switching output stage; single-chip audio DAC; single-chip digital amplifier; standard CMOS technology; CMOS digital integrated circuits; Clocks; Digital filters; Driver circuits; Power amplifiers; Power measurement; Semiconductor device measurement; Shape measurement; Solid state circuits; Switching circuits;
Conference_Titel :
Solid-State Circuits Conference, 1999. Digest of Technical Papers. ISSCC. 1999 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-5126-6
DOI :
10.1109/ISSCC.1999.759171
