비균일 양자기에 의한 과표본화율의 멀티빗트 시그마-델타 A/D 변조기의 개발

Development of Oversampled Multibit Sigma-Delta A/D Convertor with Nonuniform Quantizer

This paper has represented the new system for a multibit oversampled sigma-delta A/D convertor. The novel digital correction scheme with the ROM-Table is employed to enhance SNR without requiring accurate precision of the analogue components. This architectures have a good features compared with the 1-bit approach, including significantly lower quantization noise for a given oversampling ratio, as well as improved stability characteristics. Then we have shown the validity of the proposed system by use of the software for the performance evaluation and by realizing the system with SCFs(switched capacitor filter).