Behavioral Analysis of Second Order Sigma-Delta Modulator for Low frequency Applications
نویسنده
چکیده
Switched capacitor (SC) based modulator is prone to various non-idealities; especially at the circuit designing stage where the integrator plays an important role and effects the overall performance of the sigma delta modulator. The non idealities take account of sampling jitter which includes the effect of switching circuitry, sampling noise. Opamp parameter include noise, finite dc gain, finite band width, slew rate, saturation voltage. Each non idealities is modeled mathematically and simulation is carried out in the MATALAB SIMULINK environment with the help of sigma delta toolbox. The simulation analysis of each model is carried out individually. At last overall performance of the modulator with all nonidealities is carried out compared with the ideal modulator and satisfactory results were found out for second order sigma delta modulator for signal bandwidth of 4 KHz.
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