A 24-Bit, 8.1-MS/s D/A Converter for Audio Baseband Channel Applications

This paper study the high-level modelling and design of delta-sigma ( ) noise shapers for audio Digital-to-Analog Converter (DAC) so as to eliminate the in-band Signal-to-NoiseRatio (SNR) degradation that accompany one channel mismatch in audio signal. The converter combines a cascaded digital signal interpolation, a noise-shaping single loop delta-sigma modulator with a 5-bit quantizer resolution in the final stage. To reduce sensitivity of Digital-to-Analog Converter (DAC) nonlinearities of the last stage, a high pass second order Data Weighted Averaging (R2DWA) is introduced. This paper presents a MATLAB description modelling approach of the proposed DAC architecture with low distortion and swing suppression integrator designs. The Modulator design can be configured as a 3-order and allows 24-bit PCM at sampling rate of 64 kHz for Digital Video Disc (DVD) audio application. The modeling approach provides 139.38 dB of dynamic range for a 32 kHz signal band at -1.6 dBFS input signal level. Keywords—DVD-audio, DAC, Interpolator and Interpolation Filter, Single-Loop Modulation, R2DWA, Clock Jitter