tailieunhanh - Active Low-Pass Filter Design

Active Low-Pass Filter Design focuses on active low pass filter design using operational amplifiers. Low pass filters are commonly used to implement antialias filters in data acquisition systems. Design of second order filters is the main topic of consideration. | Texas Instruments Application Report SLOA049B - September 2002 Active Low-Pass Filter Design Jim Karki AAP Precision Analog ABSTRACT This report focuses on active low-pass filter design using operational amplifiers. Low-pass filters are commonly used to implement antialias filters in data-acquisition systems. Design of second-order filters is the main topic of consideration. Filter tables are developed to simplify circuit design based on the idea of cascading lower-order stages to realize higher-order filters. The tables contain scaling factors for the corner frequency and the required Q of each of the stages for the particular filter being designed. This enables the designer to go straight to the calculations of the circuit-component values required. To illustrate an actual circuit implementation six circuits separated into three types of filters Bessel Butterworth and Chebyshev and two filter configurations Sallen-Key and MFB are built using a TLV2772 operational amplifier. Lab test data presented shows their performance. Limiting factors in the high-frequency performance of the filters are also examined. Contents 1 Introduction .2 2 Filter 3 Second-Order Low-Pass Filter - Standard Form .3 4 Math 5 Examples .4 Second-Order Low-Pass Butterworth Second-Order Low-Pass Bessel Filter . 5 Second-Order Low-Pass Chebyshev Filter With 3-dB Ripple .5 6 Low-Pass Sallen-Key Architecture .6 7 Low-Pass Multiple-Feedback MFB 8 Cascading Filter 9 Filter Tables .8 10 Example Circuit Test Results .11 11 Nonideal Circuit Operation .14 Nonideal Circuit Operation - Nonideal Circuit Operation - MFB .16 12 Comments About Component 13 Appendix A Filter-Design Specifications .19 1 Ị Texas Appendix B Higher-Order List of Figures 1 Low-Pass Sallen-Key 2 Low-Pass MFB 3 Building Even-Order Filters by Cascading Second-Order Stages

• Điện - Điện tử
• Active Low Pass Filter Design
• Filter Characteristics
• Second Order Low Pass Filter – Standard Form
• Low Pass Sallen Key Architecture
• Cascading Filter Stages
• Example Circuit Test Results