期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2015
卷号：28
期号：4
页码：167-171
DOI：10.14445/22312803/IJCTT-V28P131
出版社：Seventh Sense Research Group
摘要：Signals dealt in real world are mostly analog in nature and are needed to convert them in digital format before processing; finally when these signals are again represented to real world a reverse conversion is necessary. The accuracy of this conversion is dependent on number of bits used and/or number of samples taken during conversion, the error between the original signal and reconstructed signal represents a noise called quantization noise. This noise can be reduced if the numbers of samples are increased. The oversampling technique is used to increase the number of samples, which reduces the spacing between the samples so the accuracy of the output is improved and SNR is increased. To further improve the performance of D/A converter, sigma delta modulator with one bit quantization level is used to decrease word length while maintaining good resolution. In this paper, some examples are used to show D/A conversion with improved SQNR by using oversampling technique.
