A multi-bit /spl Delta//spl Sigma/ audio DAC with 120 dB dynamic range

The growth of consumer 24 b audio formats such as DVD has increased the demand for low-cost audio DACs with wide dynamic range and high linearity. Multi-bit /spl Sigma//spl Delta/ modulation offers advantages for such high-end performance including relaxed out-of-band filtering requirements, smaller idle-channel tones, and reduced sensitivity to clock jitter but requires dynamic element matching (DEM) to correct nonlinearity in the internal multi-bit DAC. The key goals for DAC reported here are 120 dB dynamic range with power dissipation low enough for a stereo implementation in a low-cost plastic package, and minimized DEM die area overhead.

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