A 20 bit stereo oversampled D-to-A converter

A 20 b stereo D-to-A (digital-to-analog) converter is realized using fourth-order delta-sigma oversampling technology. A 110 dB signal-to-noise ratio and a 0.001% harmonic distortion are measured for a PDM output signal employing an oversampling ratio of 128. The chip operates with a single 2.7 V power supply and consumes 33 mW. It is implemented in a 3.6 mm*4.0 mm chip area using 0.8 mu m CMOS technology.<
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