In this paper, we propose a Simulation for the test of SNDR (Signal to noise and Distortion ratio) in Sigma Delta
ADC for SDR 3G and 4G mobile Receivers. Now a days, SNDR is one of the most important parameter which
directly effects the performance of ADC. Simulation results show the Capability of the simulink to obtain
SNDR for a 8 bit and 10 bit audio Sigma delta ADC. SNDR of ADC will always be less than SNR. The simulation
model of second order Sigma Delta ADC is given in the paper. The SNR and SNDR have been taken into account.