Design-Oriented Analysis and Practical Applications of Log-Domain Filtering

对数域过滤的面向设计的分析和实际应用

• 批准号: 9706558
• 负责人: Robert Fox
• 金额: --
• 依托单位: University of Florida
• 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 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706558&HistoricalAwards=false
• 关键词: Design; Oriented; Analysis; Practical; Applications

Even in today's increasingly digital world, analog continuous time circuits are needed in many applications. Current approaches to analog processing are running up against fundamental limitations. Log-domain filtering is a relatively new approach that offers wide dynamic range and excellent high-frequency response using simple, low-voltage circuits. Log-domain filters exploit the translinear current-voltage characteristics of bipolar transistors or weak-inversion MOSFETS to achieve overall linearity. The basic signal processing elements can be quite simple in form and their high-frequency performance can be excellent while distortion can be low because most of the transistor non-linearities are cancelled within the circuit. This research has three major thrusts: The first thrust is toward fundamental, design-oriented analysis of log-domain circuits. Design methodologies and fundamental understanding of the limitations of log-domain filters are in an early stage. Fundamental analyses allow development of figures of merit for evaluating and comparing log-domain circuits. The second thrust focuses on developing new log-domain circuit topologies. Based on an understanding of fundamental limitations, new circuits are being designed to improve performance. The third thrust is toward applications of log-domain circuits. Integrated circuits are being built and tested to demonstrate the usefulness of log-domain circuits in practical applications. Initial focus is on two application areas: low-voltage wireless communications, to exploit the performance potential of log- domain circuits and adaptive and biologically inspired circuits, to build on their fundamental simplicity.

即使在当今日益数字化的世界中，许多应用仍需要模拟连续时间电路。 当前的模拟处理方法遇到了根本性的限制。 对数域滤波是一种相对较新的方法，它使用简单的低压电路提供宽动态范围和出色的高频响应。 对数域滤波器利用双极型晶体管或弱反型晶体管的跨导线性电流-电压特性来实现整体线性度。 基本信号处理元件在形式上可以相当简单，并且它们的高频性能可以是优异的，同时失真可以是低的，因为大多数晶体管非线性在电路内被消除。 这项研究有三个主要的推力：第一推力是对基本的，面向设计的对数域电路的分析。 设计方法和对对数域滤波器的局限性的基本理解还处于早期阶段。 基本面分析允许开发用于评估和比较对数域电路的品质因数。第二个重点是开发新的对数域电路拓扑结构。 基于对基本限制的理解，正在设计新电路以提高性能。 第三个方向是对数域电路的应用。 集成电路正在建造和测试，以证明对数域电路在实际应用中的有用性。 最初的重点是两个应用领域：低电压无线通信，以利用对数域电路和自适应和生物启发电路的性能潜力，以建立在其基本的简单性。