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About Active Filters
Active filters are electronic filers that use active components such as voltage amplifiers or operational amplifiers. The amplifier shapes and stabilizes the behavior of the filter, and serves as a buffer interface to the driven component. Specifications for active filters include filter type, filter order, filter characteristic, and standards or certifications. Typically, active filters are specified as first, second, third, fourth, fifth, sixth, seventh or eight-order filters. There are two main European Union (EU) certifications for active filters: RoHS and ELV. Restriction of Hazardous Substances (RoHS) requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of specific hazardous substances. End of Life Vehicles (ELV) is a similar directive, but for automotive products.
There are five basic types of active filters: low pass, high pass, band pass, band reject, and universal or programmable. Low pass filters attenuate frequencies below a frequency called the cut-off frequency. High pass filters attenuate frequencies above the cut-off frequency. Bandpass filters are active filters that are used to attenuate frequencies above and below a range of frequencies (i.e., the bandwidth or passband of the filter). Any signal with a frequency within the bandpass range passes through the filter. Any signal with a frequency outside the bandpass is reduced. Band reject filters (band stop filters, notch filters) are used to attenuate a range of frequencies and allow all other frequencies to pass. Universal filters can be configured by the user to function as a low pass, high pass, band pass, or band stop filter.
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Engineering Web: Active Filters
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A Basic Introduction to Filters - Active, Passive and... Note 779 Kerry Lacanette Filters Active Passive April 1991 Introduction and Switched-Capacitor 1 0 INTRODUCTION Filters of some sort are essential to See National Semiconductor Information |
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OA-26 Designing Active High Speed Filters Designing Designing Active High National Semiconductor OA-26 Speed Filters Mark Sauerwald February 2005 Active Filters built from resistors (R), See National Semiconductor Information |
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How Not to Design Active Filters (Or Not Only Sharks Distract... See Analog Devices, Inc. Information |
Part Numbers for Active Filters
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| AN1281SSMTXL | Digi-Key | Panasonic - SSG | Integrated Circuits (ICs) | IC RIPPLE FILTER SSMINI-5 |
| LTC1060CN#PBF | Digi-Key | Linear Technology | Integrated Circuits (ICs) | IC FILTER BUILDING BLOCK 20-DIP |
| LTC1064-3CN#PBF | Digi-Key | Linear Technology | Integrated Circuits (ICs) | IC FILTR 8TH ORDR LOWPASS 14-DIP |
| LTC1060CSW#PBF | Digi-Key | Linear Technology | Integrated Circuits (ICs) | IC FILTER BUILDING BLOCK 20-SOIC |
| AMC1210IRHAR | Digi-Key | Texas Instruments | Integrated Circuits (ICs) | IC QUAD FILTR FOR D-S MOD 40VQFN |
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