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Practical Analog and Digital Filter Design

Knjiga je namenjena konstruiranju filtrov.

Vsebina

Chapter 1 Introduction to Filters and Filter Design Software 1
1.1 Filter Selectivity 2
1.1.1 Lowpass Filters 3
1.1.2 Highpass Filters 4
1.1.3 Bandpass Filters 5
1.1.4 Bandstop Filters 5
1.2 Filter Approximation 6
1.3 Filter Implementation 8
1.4 WFilter - Filter Design Software 9
1.5 Conclusion 14
Chapter 2 Analog Filter Approximation Functions 15
2.1 Filter Transfer Functions 15
2.1.1 Transfer Function Characterization 16
2.1.2 Pole-Zero Plots and Transfer Functions 17
2.1.3 Normalized Transfer Functions 18
2.2 Butterworth Normalized Approximation Functions 19
2.2.1 Butterworth Magnitude Response 19
2.2.2 Butterworth Order 20
2.2.3 Butterworth Pole Locations 20
2.2.4 Butterworth Transfer Functions 21
2.3 Chebyshev Normalized Approximation Functions 27
2.3.1 Chebyshev Magnitude Response 27
2.3.2 Chebyshev Order 28
2.3.3 Chebyshev Pole Locations 28
2.3.4 Chebyshev Transfer Functions 29
2.4 Inverse Chebyshev Normalized Approximation Functions 34
2.4.1 Inverse Chebyshev Magnitude Response 34
2.4.2 Inverse Chebyshev Order 35
2.4.3 Inverse Chebyshev Pole-Zero Locations 35
2.4.4 Inverse Chebyshev Transfer Functions 37
2.5 Elliptic Normalized Approximation Functions 43
2.5.1 Elliptic Magnitude Response 43
2.5.2 Elliptic Order 45
2.5.3 Elliptic Pole-Zero Locations 45
2.5.4 Elliptic Transfer Functions 47
2.6 Comparison of Approximation Methods 52
2.7 Conclusion 54
Chapter 3 Analog Lowpass, Highpass, Bandpass, and Bandstop Filters 55
3.1 Unnormalized Lowpass Approximation Functions 55
3.1.1 Handling a First-Order Factor 57
3.1.2 Handling a Second-Order Factor 58
3.2 Unnormalized Highpass Approximation Functions 60
3.2.1 Handling a First-Order Factor 61
3.2.2 Handling a Second-Order Factor 62
3.3 Unnormalized Bandpass Approximation Functions 64
3.3.1 Handling a First-Order Factor 66
3.3.2 Handling a Second-Order Factor 66
3.4 Unnormalized Bandstop Approximation Functions 72
3.4.1 Handling a First-Order Factor 73
3.4.2 Handling a Second-Order Factor 73
3.5 Analog Frequency Response 76
3.5.1 Mathematics for Frequency Response Calculation 76
3.5.2 C Code for Frequency Response Calculation 80
3.6 Saving the Filter Parameters 82
3.7 Conclusion 84
Chapter 4 Analog Filter Implementation Using Active Filters 85
4.1 Implementation Procedures for Analog Filters 85
4.2 Lowpass Active Filters Using Op-amps 87
4.3 Highpass Active Filters Using Op-amps 92
4.4 Bandpass Active Filters Using Op-amps 96
4.5 Bandstop Active Filters Using Op-amps 98
4.6 Implementing Complex Zeros with Active Filters 103
4.7 Analog Filter Implementation Issues 106
4.7.1 Component Selection 106
4.7.2 Sensitivity Analysis 108
4.8 Using WFilter in Active Filter Implementation 111
4.9 Conclusion 113

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