Page 8 - Analog and Digital Filter Design
P. 8
CONTENTS
Preface 13
1
CHAPTER Introduction 19
Fundamentals 19
Why Use Filters? 19
What Are Signals? 19
Decibels 21
The Transfer Function 21
Filter Terminology 22
Frequency Response 23
Phase Response 24
Analog Filters 25
The Path to Analog Filter Design 29
Digital Filters 31
Signal Processing for the Digital World 31
The "Brick Wall" Filter 34
Digital Filter Types 38
The Path to Digital Filter Design 39
Exercises 39
2
CHAPTER Time and Frequency Response 41
Filter Requirements 41
The Time Domain 44
Analog Filter Normalization 46
Normalized Lowpass Responses 47
Bessel Response 47
Bessel Normalized Lowpass Filter Component Values 49
Butterworth Response 54
Butterworth Normalized Lowpass Component Values 55
Normalized Component Values for RL >> RS or RL << RS 56
Normalized Component Values for Source and Load
Impedances within a Factor of Ten 57
