开关电流技术及其在滤波器设计中的应用研究

【作者】 伊晓燕；

【导师】 蔡国昌； 王碧莲；

【作者基本信息】 湖南大学 ， 电工理论与新技术， 2003， 硕士

【摘要】 论文深入探讨了开关电流技术及其在滤波器设计中的应用，并以现有无源网络和开关电容技术为基础，提出了一些基于开关电流技术的新型滤波器模块和滤波器设计方法。文中系统分析了开关电流技术的基本工作原理，以此为基础给出延迟模块、通用积分器、通用微分器、改进型前馈差分器、LDI模块、双抽样方式的改进型双线性模块、基于积分器／微分器的双二次节、改进型双二次滤波器节、三阶积木块等实用模块电路。提出了应用负反馈技术、全差分技术、甲乙类技术、S~2I技术及钟馈效应消除技术的各种加强电路结构，用以补偿由开关电流电路非理想特性引起的各种误差。总结分析了实现高精度开关电流滤波器设计的各种实用方法，包括Z域综合法、欧拉映射法、模拟无源LC网络和开关电容网络的状态变量法、矩阵分解法和信号流图转置法，并对左分解法加以整理改进，提出一种更为简洁的设计结构，通过减化输入电路克服一般电路中存在的占用硅片面积大、灵敏度高等问题。同时针对各种设计方法分别给出低通、高通、带通开关电流滤波器的设计实例，以验证这些方法的实用性。此外还提出了基于改进型前馈微分器的高通开关电流滤波器设计方法，简化了设计步骤和电路结构。介绍了数字可编程FIR滤波器和SI-OTA自动调谐滤波器等新型开关电流滤波器，并分别给出设计实例和设计注意事项。更多还原

【Abstract】 In this thesis, theory of switched-current (SI) technology and its application in the design and synthesis of active filters are researched deeply and systematically. Some new switched-current building-blocks and exact approach methods of switched-current filters (SIF) are proposed from modern LC networks and switched capacitor (SC) technology. Based on the analysis of operation principles of switched-current circuits, some true switched-current building-blocks are proposed and reviewed, which include the delay cell, generalised integrator, generalised differentiator, LDI cells, double-sampling bilinear building-blocks, bilinear feed-forward differentiator, third-order building-blocks, integrator and differentiator based biquadratic filter sections and their modified structures. To compensate the error originated from the non-ideal character of the SI circuits, some novel structures based on the technology of negative feedback, fully differential, class AB, SnI and other technologies to compensate the clock feed through effects are proposed and analyzed. The exact design methods of switched-current filters are summarized, such as the director synthesis of Z-plane, Euler mapping, state variable analysis, matrix decomposition, and signal-flow-graph simulation of the LC and switched capacitor prototypes. At the same time, a modified leftdecomposition matrix method is proposed to overcome the usual problems of large silicon area, high sensitivity and component spreads by minimizing the input circuits. Examples of switched-current low-pass, high-pass and band-pass filters are given to verify the feasibility of these methods. To make the exact design of low-sensitivity switched-current high-pass filters be convenient, a new design methods using the novel bilinear feed-forward differentiator is proposed. At the end two examples about digitally programming FIR filter and SI-OTA auto-tuning filter are given.更多还原