A 0.22mm/sup 2/ 7.25mW per-channel audio stereo-DAC with 97dB-DR and 39dB SNRout

Abstract

In the stereo audio DAC presented here, the trade-off between area-power consumption-SNRout-dynamic range is optimized for the case of a 96 dB audio system. Using a single-op amp switched capacitor structure for the reconstruction filter, a hybrid FIR/IIR transfer function allows it to reject out-of-band noise. This circuit solution strongly reduces area and power consumption. In a 0.13 /spl mu/m CMOS technology, the stereo DAC achieves a 97 dB-dynamic range and a 39 dB SNRout with a 0.22 mm/sup 2/ area and 7.25 mW power consumption per-channel.