Behavior Model of Sigma Delta Modulator for Mobile Digital TV

The paper presents the behavior model of sigma delta modulator implemented in the MATLAB SIMULINK environment. The proposed model takes into account most of the sigma delta modulator non-idealities, such as KT/C noise, and operational amplifier parameters (white noise, finite dc gain, finite bandwidth, slew rate and saturation voltages). Simulation results on a third-order four-bit low pass sigma delta modulator demonstrate the validity of the models proposed. The proposed model attains a good accuracy, while maintaining the fast simulation speed, which greatly improves the design efficiency.