Dithering Techniques for Delta-Sigma Modulator Based Digital-to-Analog Converters

本研究的目的是发展信号处理理论和技术，以解决实际集成的基于delta-sigma调制器的数模转换器（dac）中的尺寸误差和非线性器件行为等电路缺陷。这些dac是许多电子系统的重要组成部分，包括无线电收发器和音频和视频设备。提出的方法是利用δ - σ调制器输入信号的随机抖动来调节其量化噪声的统计量；这样的调理会降低DAC对上述电路误差的灵敏度。该研究的预期结果是高性能dac，易于设计，并且具有足够的鲁棒性，可以提供高制造成品率，而不像传统的dac使用广泛的基于仿真的优化策略来设计。这项研究的智力价值在于，它提出了一种根本不同的方法来对抗dac中的电路错误：一种不依赖于电路优化，而是应用信号处理技术来提高电路性能的方法。此外，该研究旨在重新调整理论数据转换器的研究，以解决实际电路设计者面临的相关问题。该项目更广泛的影响是双重的。首先，它解决了构建高性能数模转换器的问题，这对电子工业的发展至关重要。第二，它将鼓励来自代表性不足的群体的学生从事高级工程事业，提供专门从这些群体中招募的研究生和暑期实习生，在PI的密切监督下参与拟议的项目。

The objective of this research is to develop signal processing theories and techniques to combat circuit impairments such as sizing errors and nonlinear device behavior in practical, integrated, delta-sigma modulator based digital-to-analog converters (DACs). These DACs are vital components in many electronic systems including radio transceivers and audio and video equipment. The proposed approach is to use random dithering of the delta-sigma modulator input signal to condition the statistics of its quantization noise; such conditioning will reduce the DAC's sensitivity to the aforementioned circuit errors. The expected outcome of the research is high performance DACs that are easy to design and sufficiently robust to offer high fabrication yields, unlike traditional DACs that are designed using extensive simulation-based optimization strategies.The intellectual merit of the research is that it presents a fundamentally different approach to combating circuit errors in DACs: an approach that does not depend on circuit optimization but applies signal processing techniques to improve circuit performance. Furthermore, the research aims at realigning theoretical data converter research to address relevant problems faced by practical circuit designers.The broader impacts of the project are two-fold. First, it addresses the problem of building high performance digital-to-analog converters that are crucial to the growth of the electronics industry. Second, it will encourage students from underrepresented groups to take up advanced engineering careers by providing graduate students and summer interns recruited specifically from such groups to work on the proposed project under close supervision of the PI.