Design Of MASH 2-2 Sigma-Delta Modulators And Its Simulation In MATLAB

A major challenge for mixed signal circuit design is to balance between system simulation time and accuracy for the real non-ideal effects.Sigma-Delta modulator is such a kind of circuit that is very popular in signal processing and communication systems nowadays.Its behavioral model is constructed and analyzed of non-idealities are included in this thesis.Almost all the non-idealities are applied into the proposed wide band architecture,which is not mentioned before.The behavioral model of a fourth order 2-2 MASH sigma delta modulator for WLAN is presented.The model is built by using MATLAB/SIMULINK environment.It considers most of the sigma delta modulator non-idealities,such as thermal noise of switches,clock jitter,and operational amplifier parameters(white noise,finite dc gain,finite bandwidth,slew rate and saturation voltages).Simulation results show the validity of the proposed models.These models introduce balance between good accuracy and fast simulation speed which improves the system performance and efficiency.