Title :
A multibit delta-sigma audio DAC with 120-dB dynamic range
Author :
Fujimori, Ichiro ; Nogi, Akihiko ; Sugimoto, Tetsuro
Author_Institution :
AKM Semicond., San Diego, CA, USA
Abstract :
A 24-bit 192-kHz sample-rate digital-to-analog converter (DAC) achieves 120-dB A-weighted dynamic range in the 20-kHz band, and consumes 310 mW with a 5-V power supply. A third-order five-bit /spl Delta//spl Sigma/ architecture optimized for high-end consumer audio has been developed and used. A switched-capacitor (SC) DAC combined with infinite-impulse response (IIR) and finite-impulse response (FIR) filters is employed to increase immunity to clock jitter, and reduce analog power. Partial-range dynamic element matching (DEM) enhances mismatch shaping with reduced circuit overhead. The 7.8-mm/sup 2/ chip fabricated in 0.5-/spl mu/ m CMOS integrates a stereo DAC and all functions required for DVD-audio playback.
Keywords :
CMOS integrated circuits; audio signal processing; delta-sigma modulation; switched capacitor networks; 0.5 micron; 192 kHz; 24 bit; 310 mW; 5 V; DVD-audio playback; FIR filter; IIR filter; clock jitter; consumer audio; digital-to-analog converter; dynamic element matching; dynamic range; low power CMOS chip; multibit delta-sigma architecture; stereo DAC; switched capacitor circuit; Circuits; Clocks; Digital modulation; Digital-analog conversion; Dynamic range; Finite impulse response filter; Jitter; Power supplies; Quantization; Semiconductor device noise;
Journal_Title :
Solid-State Circuits, IEEE Journal of
