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A 1.5 V, 4.1 mW dual-channel audio delta-sigma D/A converter

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2 Author(s)
Fujimori, I. ; AMK DesignTek, San Diego, CA, USA ; Sugimoto, T.

The paper describes a stereo digital-to-analog converter intended for portable digital-audio which operates at 1.5 V and consumes only 4.1 mW. A 15-level quantization, third-order delta-sigma was employed to reduce digital operation speed, relax out-of-band filtering requirements, and enhance immunity to clock jitter. The use of direct charge transfer switched-capacitor technique in the multibit reconstruction DAC reduces kT/C noise and element mismatch without increase of power dissipation. The data weighted averaging algorithm suppresses nonlinearity caused by capacitor mismatch by first-order noise-shaping, thereby making mismatch-induced noise negligible. The stereo audio DAC achieves 90 dB dynamic range and 81 dB peak signal-to-noise-plus-distortion ratio over a 20 kHz passband. The 5.3 mm 2 chip is fabricated in a 0.6 μm CMOS technology which includes low-threshold devices

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Solid-State Circuits, IEEE Journal of  (Volume:33 ,  Issue: 12 )