本篇論文描述一個利用電流模式設計之低電壓低通濾波器。利用電流模式積分器組成一個Biquad電路，使截止頻率提升為680百萬赫茲，一般的Biquad電路主要由兩個區塊所組成，分別為lossy 及lossless差動積分器，可藉由改變偏壓電流來改變濾波器的截止頻率。此電路在2.5伏特的電源下工作，其消耗功率約為3.76毫瓦。使用0.25微米互補金氧半製成。

Low voltage CMOS low pass filter using current-mode techniques is presented. The 680NHz cutoff frequency is achieved by using current-mode integrator as a building block of the current-mode biquad. A universal biquad is constructed from two basic building blocks, lossless and lossy differential current-mode integrators. Tuning of the biquad is obtained by changing the bias currents. The power consumption is 3.76mW with 2.5V supply voltage. The chip is fabricated in 0.25μm CMOS process.

Table of Contents
Abstract (Chinese) i
Abstract (English) ii
Table of Contents iii
List of Figures v
List of Tables vii
CHAPTER1 INTRODUCTION………………………………………..1
1.1 MOTIVATION………………………………….………1
1.2 THESIS ORGANIZATION……………………………………..3
CHAPTER2 SYSTEM ARCHITECTURE…………………………...4
2.1 ANALOG FILTER……………………………………………...4
2.2 DIGITAL FILTER……………………………………….5
CHAPTER3 CURRENT-MODE INTEGRATOR……………………7
3.1 INTRODUCTION TO CURRENT-MODE CIRCUIT…………………7
3.2 THE FIRST CURRENT CONVEYOR………………………………8
3.3 THE SECOND CURRENT CONVEYOR……………………………9
3.4 A BASIC CIRCUIT REALIZATION OF CCⅡ…………………10
3.5 LOSSY CURRENT-MODE INTEGRATOR…………………………11
3.6 LOSSLESS CURRENT-MODE INTEGRATOR……………………13
CHAPTER4 CIRCUIT DESIGN AND SIMULATION……………17
4.1 BIQUAD CIRCUIT………………………………………17
4.2 SIMUALTION RESULT OF BIQUAD CIRCUIT…………………20
4.3 SENENTH-ORDER FILTER……………………………………21
4.4 BOOST FUNCTION…………………………………………25
CHAPTER5 NONIDEAL EFFECT…………29
5.1 MISMATCH……………………………………………………29
5.1.1 Mismatch of lossy integrator……………30
5.1.2 Mismatch of lossless integrator………31
5.1.3 Mismatch of seventh-order filter………33
5.2 ACCURACY OF THE CAPACITANCE……………………………33
CHAPTER6 CONCLUSION………………39

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