A 113 dB SNR oversampling sigma-delta DAC for CD/DVD application

A sigma-delta (ΣΔ) audio digital-to-analog converter (DAC) for CD and digital versatile disk (DVD) application is presented. The converter uses a 6-bit modulator and a segmented noise-shaped scrambling technique to achieve a 113 dB dynamic-range over a 20 kHz bandwidth. A continuous-time output stage is used to achieve a high signal-to-noise (SNR) in a small die area. This output stage employs a dual return-to-zero scheme to eliminate errors caused by inter-symbol interference (ISI). The converter is fabricated in a 0.6 μm double-poly double-metal CMOS process. The chip occupies 3.1×3.2 squared mm and operates from a single 5 V supply