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High-Resolution ADCs for Biomedical Imaging Systems

机译:用于生物医学成像系统的高分辨率ADC

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With the rapid development of biomedical imaging systems, the requirement of the accuracy of an Analog-to-Digital Converter (ADC) becomes more and more critical. Traditional Nyquist-rate analog to digital data converters cannot meet the requirement any more. Sigma-Delta analog to digital data converter, which makes a trade-off between speed and accuracy, can achieve an ideal accuracy by employing the oversampling and noise-shaping technology. In this work, a Verilog-AMS model for sigma-delta modulator is built, including the topologic, the order of stage, oversampling rate, system parameters, etc. On the basic of theoretical analysis and scientific flow path, finally, a third-order 1-bit sigma-delta modulator is designed and optimized, whose performance agrees well with the theoretical module.
机译:随着生物医学成像系统的快速发展,模数转换器(ADC)的准确性的要求变得越来越重要。传统的奈奎斯特速率模拟到数字数据转换器不能再满足要求。 Sigma-Delta模拟到数字数据转换器,在速度和精度之间进行权衡,可以通过采用过采样和噪声整形技术来实现理想的准确性。在这项工作中,构建了Sigma-Delta调制器的Verilog-AMS模型,包括拓扑,舞台,过采样率,系统参数等。在理论分析和科学流动路径的基础上,最后,三分之一 - 订购1位Sigma-Delta调制器设计和优化,其性能与理论模块很好。

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