High-Resolution, Broadband VLSI Data Conversion Interfaces

高分辨率、宽带 VLSI 数据转换接口

• 批准号: 9710647
• 负责人: Bruce Wooley
• 金额: $ 27.5万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9710647&HistoricalAwards=false
• 关键词: Resolution; Broadband; VLSI; Data; Conversion

In systems wherein information is represented and processed digitally, the level of overall system performance that can be achieved is often limited by the speed and dynamic range of the interfaces between analog and digital representations of that information. Since digitally encoded signals can be processed with virtually arbitrary precision, continued progress in the scaling of integrated circuit technology is accomplished by corresponding demand to improve the precision and speed of so-called data conversion interfaces. This pressure is, in turn, accompanied by two constraining factors: the desire to embed data conversion interfaces within large digital signal processing circuits and explosive growth in the demand for portable electronic systems. The integration of data conversion circuits in VLSI technologies imposes severe constraints on the dynamic range available to implement those circuits, while the concern for battery life in portable systems often dictates substantial reductions in power dissipation in comparison to traditional applications. The principal objective of this research is to discover circuit design techniques for digitizing signals with bandwidths of several MHz using standard digital CMOS technologies. The research focuses on the use of oversampling methods to encode MHz-bandwidth radio signals centered at IF frequencies in the range of a few tens of MHz and on methods of increasing the resolution of Nyquist-rate converters for digitizing baseband signals with bandwidths on the order of 10 MHz. A complementary theme of the research is operation from a low supply voltage with minimum power dissipation.

在以数字方式表示和处理信息的系统中，可以实现的整体系统性能水平通常受到该信息的模拟和数字表示之间接口的速度和动态范围的限制。由于数字编码信号可以以几乎任意的精度进行处理，因此集成电路技术的持续进步是通过提高所谓数据转换接口的精度和速度的相应需求来实现的。这种压力反过来又伴随着两个制约因素：在大型数字信号处理电路中嵌入数据转换接口的愿望以及对便携式电子系统需求的爆炸性增长。VLSI技术中数据转换电路的集成对实现这些电路的动态范围施加了严格的限制，而便携式系统中对电池寿命的关注通常要求与传统应用相比，功耗大幅降低。本研究的主要目的是发现使用标准数字CMOS技术将带宽为几兆赫兹的信号数字化的电路设计技术。研究重点是使用过采样方法对以中频频率为中心的几十MHz范围内的MHz带宽无线电信号进行编码，以及提高奈奎斯特速率转换器对带宽为10 MHz的基带信号进行数字化的分辨率的方法。本研究的另一个补充主题是在低电源电压下以最小功耗进行操作。