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Filtros

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Re: Filtros

Notapor gus » Mar, 17 Abr 2012, 15:45

Analog and RF Filters Design Manual:



1 INTRODUCTION............................................................................................................................................. 4
1.1 GENERAL TYPES OF FILTERS ............................................................................................................................ 4
1.2 REAL FILTERS RESPONSES ............................................................................................................................... 6
1.2.1 Transition Band .................................................................................................................................... 6
1.2.2 Passband and Stopband Ripple ............................................................................................................. 8
1.3 FILTER TRANSFER FUNCTION AND SPECTRAL RESPONSE ................................................................................. 9
1.3.1 Transfer Functions ............................................................................................................................... 9
1.3.2 Bode Plot ............................................................................................................................................ 10
1.3.3 Power Spectrum .................................................................................................................................. 10
1.3.4 Filter Design Process .......................................................................................................................... 11
2 NAMED FILTERS: BUTTERWORTH, CHEBYSHEV AND MORE ...................................................... 13
2.1 THE BUTTERWORTH LOWPASS FILTER .......................................................................................................... 13
2.1.1 Solving for the Butterworth Filter poles: ............................................................................................. 14
2.1.1.1 For n odd: ....................................................................................................................................................... 14
2.1.1.2 For n even: ..................................................................................................................................................... 14
2.1.2 Matlab Code and Example Plots ......................................................................................................... 14
2.1.3 What if we want to change the frequency … ........................................................................................ 17
2.2 THE CHEBYSHEV LOWPASS FILTER ............................................................................................................... 17
3 SIMPLE CIRCUITS THAT PERFORM FILTERING ............................................................................... 18
3.1 PASSIVE “IMPEDANCE DIVIDER” FILTER CIRCUIT .......................................................................................... 18
3.1.1 Low Pass Filter ................................................................................................................................... 18
3.1.2 A Simple High-Pass Circuit ................................................................................................................. 19
3.2 SIMPLE ACTIVE FILTERS WITH OP AMPS........................................................................................................ 20
3.2.1 Low-Pass filters - the integrator reconsidered. ................................................................................... 20
3.2.2 High-Pass filters - the differentiator reconsidered. ............................................................................. 23
3.2.3 Band-Pass circuits ............................................................................................................................... 24
3.3 SECOND ORDER ACTIVE FILTERS WITH OP AMPS .......................................................................................... 26
3.3.1 Sallen-Key Circuit Lowpass Filter ...................................................................................................... 26
3.3.1.1 Function Derivation ........................................................................................................................................ 27
3.3.2 Multiple Feedback Lowpass Filter ...................................................................................................... 29
3.3.2.1 Function Derivation ........................................................................................................................................ 30
3.3.3 Third-Order Sallen-Key Variant Circuit Lowpass Filter .................................................................... 31
3.3.3.1 Function Derivation ........................................................................................................................................ 32
3.3.4 High Q (Low Bandwidth) Bandpass Filters. ........................................................................................ 34
3.3.4.1 Function Derivation ........................................................................................................................................ 35
3.4 OTHER USEFUL CIRCUITS .............................................................................................................................. 37
3.4.1 Parallel combination of filters ............................................................................................................. 37
3.4.2 Differential Amplifier: ......................................................................................................................... 37
4 USING TRANSFER FUNCTIONS AND OPAMP FILTERS TO DESIGN A PRACTICAL FILTER .. 38
5 COMPONENT REFERENCES ..................................................................................................................... 40
6 COMPONENTS: MANUFACTURERS AND SALES ................................................................................. 41
6.1 MANUFACTURERS ......................................................................................................................................... 41
6.1.1 Active Components .............................................................................................................................. 41
6.1.2 Passive Components ............................................................................................................................ 41
6.1.3 Component Sales ................................................................................................................................ 41
7 REFERENCES ................................................................................................................................................ 42
gus
 
Mensajes: 104
Registrado: Jue, 29 Mar 2012, 19:33


Re: Filtros

Notapor gus » Mar, 17 Abr 2012, 15:50

Fundamentals of Active Filters



1. Course Navigation
1. 1.1 Course Navigation
2. Active Filter Fundamentals
1. 2.1 What is a Filter
2. 2.2 Types of Filters
3. 2.3 Passive vs. Active Filters
3. Low Pass Filters
1. 3.1 Basic Ideal Filter Response
2. 3.2 Butterworth Low-pass Filter Response
3. 3.3 Chebyshev Low-pass Filter Response
4. 3.4 Bessel Low-pass Filter Response
5. 3.5 First Order Active Filters
6. 3.6 Selecting the Passive Components
7. 3.7 The "Scalable" Filter
8. 3.8 Second Order Low-pass Filter
9. 3.9 Multiple Feedback Topology (MFB)
10. 3.10 Higher Order Filters
11. 3.11 Component Selection
12. 3.12 Reference Material
4. High Pass Filters
1. 4.1 High-Pass Filter Design
2. 4.2 Second Order High Pass Filter
gus
 
Mensajes: 104
Registrado: Jue, 29 Mar 2012, 19:33


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