Simulink System Model of Sigma-Delta Analog-Digital Converter Modulator
Yang Yintang · Jisuanji fangzhen · 2008
Based on the structure of Sigma-Delta analog-to-digital converter, a system modeling method for over-sampling sigma-delta modulator was proposed by Simulink which is a simulation tool. Considering the modulator structure and the noise of circuits, the non-ideal system model for second-order low-pass and band-pass sigma-delta modulator were founded. For verifying the modeling method, the PSD and SNR of the modulators models was simulated. The proposed modeling method for Sigma-Delta modulator is significant for Sigma-Delta analog-to-digital converter design.