A Graphical User Interface Implementation of Second Order Sigma- Delta Analog to Digital Converter with Improved Performance Parameters
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2014, Vol 2, Issue 7
Abstract
Analog to Digital Converters are widely used in the field of VLSI and are mainly used in the applications like audio, instrumentation, seismic, voice etc which requires higher value of resolution. For such applications, ADC’s can be used based on Nyquist Rate modulators (where sampling is done with twice the sampling frequency) or Sigma-Delta modulators (where sampling is done with 15-20 times the sampling frequency). ADC based on sigma-delta modulators is attractive for VLSI implementation because they are not so sensitive of circuit non-idealities and component mismatch. However, issues such as clock jitter and excess loop delay become great challenges to the designer, especially at high sampling frequency. Special design should be applied to overcome these problems. Sigma-Delta modulator can be of different orders like 1st order, 2nd order etc and can be continuous time (less power consumption) or Discrete Time (less sensitive to non- idealities). This work demonstrates a Graphical User Interface (GUI) of 2nd order Sigma-Delta modulator which is used to check the non-idealities of the circuit. Here the model is based on the behavioral modeling of the parameters with the help of Matlab - Simulink and the parameters like Signal to Noise Ratio (SNR) & Effective Number of Bits (ENOB) (which in turn gives the Resolution) are calculated. The value of SNR and ENOB are found to be 107.88 dB and 17.61 bits respectively in comparison to the 89.4, 94.7 dB & 14.56, 15.44 bits respectively of the previous work. Since the value of SNR and ENOB are increased it makes the respective signal power and Resolution better. The Graphical User Interface (GUI) of overall model has been successfully implemented after modelling of non-idealities.
Authors and Affiliations
Prateek Verma, Anil Kumar Sahu, Dr. Vivek Kumar Chandra, Dr. G. R. Sinha
Keywords
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