A 113DB SNR OVERSAMPLING SIGMA-DELTA, DAC FOR OD DVD APPLICATION/

A sigma-delta (Sigma Delta) audio digital-to-analog converter (DAC) fo r CD and digital versatile disk (DVD) application is presented. The co nverter uses a 6-bit modulator and a segmented noise-shaped scrambling technique to achieve a 113dB dynamic-range over a 20kHz bandwidth. A continuous-time output stage is used to achieve high signal-to-noise ( SNR) in a small die area. This output stage employs a dual return-to-z ero scheme to eliminate errors caused by inter-symbol interference ISI ). The converter is fabricated in a 0.6 mu m double-poly double-metal CMOS process. The chip occupies 3.1x3.2 squared mm and operates from a single 5V supply.