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使用LT1228量測與驗證電壓模式萬用二階濾波器 = Measurement and verification of voltage-mode universal second-order filter using LT1228s / 陳永明.

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摘要註

本文提出兩種電壓模式二階濾波器的設計、測量和驗證，每種濾波器使用三個LT1228、兩個接地電容器和七個或九個電阻器。第一種設計經由選擇兩個輸入訊號和六個輸出訊號，可以提供低通、帶通、高通和帶拒濾波器響應的獨立增益控制。第二種設計使用訊號合成技術，將具有全通濾波器響應的萬用二階濾波器融入到第一種設計電路中。每種電路具有兩個高阻抗輸入端，方便輸入訊號的串接，並具有三個低阻抗輸出端，方便輸出訊號的量測。本文提出的兩種電路是使用OrCAD PSpice軟體進行模擬，並在印刷電路板上進行實體電路測試，模擬分析和測量結果驗證兩種電路的理論設計。本文各章節安排如下：第一章為前言，主要是介紹先前的研究發展方向與研究動機，第二章為LT1228元件介紹及功能模擬與實測，第三章為本文核心電路設計、模擬、測量和驗證，第四章為結論與未來改進。. This thesis presents the design, measurement, and validation of two voltage-mode second-order filters, each using three LT1228s, two grounded capacitors, and seven or eight resistors. The first design provides independent gain control of low-pass, band-pass, high-pass, and notch filter responses by selecting two input and six output signals. The second design uses signal synthesis techniques to present a universal second-order filter with an all-pass filter response into the first design circuit. Each circuit features one or two high-impedance input terminals for easy signal cascading and three low-impedance output terminals for convenient signal measurement. The two design circuits proposed in this thesis were simulated using OrCAD PSpice software and tested on a printed circuit board. The simulation analysis and measurement results validate the theoretical design of the two circuits. Finally, the thesis chapters are organized as follows: Chapter 1 provides an introduction, outlining the background of previous research developments and the motivation for this study. Chapter 2 presents an overview of the LT1228 component, along with its functional simulation and experimental measurements. Chapter 3 details the core circuit design of this thesis, including simulations, measurements, and validation. Chapter 4 offers conclusions and suggestions for future improvements..

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