An active filter is a type of analog electronic filter , distinguished by the use of one or more active components i.e. voltage amplifiers or buffer amplifiers
http://en.wikipedia.org/wiki/Active_filter

Abstract :     An active filter comprising a first operational amplifier ( 10 ) disposed in an inverting integral configuration through a feedback capacitor ( 14 ) and a main ...
http://www.delphion.com/details?pn10=US07038531

Active Filter Workshop Active Filter Design Figure 1. Design Screen for Sallen & Key Filters. Summary: Active Filter Workshop is a suite of filter-design utility programs designed ...
http://ourworld.compuserve.com/homepages/f_ostrander/afilterw.htm

Electrotek Concepts, Inc. 1 ACTIVE FILTER DESIGN AND SPECIFICATION FOR CONTROL OF HARMONICS IN INDUSTRIAL AND COMMERCIAL FACILITIES Mark McGranaghan Electrotek Concepts, Inc ...
http://www.dranetz-bmi.com/pdf/activeFilter.pdf

p> FilterPro™ Multiple Feedback (MFB) and Sallen-Key Design Program is a Windows application. This application designs MFB and Sallen-Key low-pass and high-pass filters using ...
http://focus.ti.com/docs/toolsw/folders/print/filterpro.html

P>The UAF42 is a universal active filter that can be configured for a wide range of low-pass, high-pass, and band-pass filters. It uses a classic state-variable analog architecture ...
http://focus.ti.com/docs/prod/folders/print/uaf42.html

An interdisciplinary website for science, programming, electronics and more. ... Reverse engineer the active filter: Use the "Resistor Series lookup" tool below to get values for ...
http://www.captain.at/electronics/active-filter/

active filter and 555 timer electronic circuit capture, design and simulation software. ... Filter Wiz PRO . active filter design more... 555 Timer PRO. 555 Timer resource
http://www.schematica.com/

Amazon.com: Active Filter Cookbook, Second Edition: DON LANCASTER: Books ... Product Description This Don Lancaster classic is by far the best-selling active filter book of all ...
http://www.amazon.com/Active-Filter-Cookbook-Second-LANCASTER/dp/075062986X

Amazon.com: Active-Filter Cookbook: Donald E. Lancaster: Books ... Product Description This Don Lancaster classic is by far the best-selling active filter book of all time.
http://www.amazon.com/Active-Filter-Cookbook-Donald-E-Lancaster/dp/0672211688

Active Filter suppresses electrical noises that are generated by modern electrical and electronic equipments. ... Digital Energy? Active Filter. With the increase of modern ...
http://www.gedigitalenergy.co.uk/products/Active-Filter.html

Active Filter, Active Filter India, Active Filter Gujarat, Active and Passive Filter, Active and Passive Filter India, Passive Filter Gujarat
http://www.powerquality.co.in/company-profile.html

National's operational amplifier ICs enable enhanced system performance with the best speed/power products, accuracy and lowest noise, and smallest package. National Semiconductor ...
http://www.national.com/appinfo/amps/webench_filters.html

To order this title, and for more information, click here Second Edition By DON LANCASTER Description This Don Lancaster classic is by far the best-selling active filter book of ...
http://www.elsevier.com/wps/product/cws_home/679785

Cutting-edge active filter media offers superb biological, mechanical, and chemical filtration. ... Use all four filter media together for remarkably clean, clear aquarium water
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4136+15440&pcatid=15440

Active Filer Download Page. Lost documents cost time, money, clients and even your business. Make sure your documents and emails are filed properly with ActiveFiler.
http://www.shareup.com/Active_Filer-download-49191.html

A simple tool for designing active filters using voltage-feedback opamps. ... Interactive Design Tools: OpAmps : Active Filter Synthesis: A simple tool for designing active filters ...
http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/filter/filter.html

active filter ( ?aktiv ?filt?r ) ( electronics ) A filter that uses an amplifier with conventional passive filter elements to provide a desired fixed
http://www.answers.com/topic/active-filter

Successful use of a passive filter in a subwoofer is highly unrealistic. The seemingly simple task of just creating a crossover function at 100-150 Hz with a ...
http://member.newsguy.com/~stigerik/almighty/active_filter.html

MaxSine is a highly versatile harmonic Active Filter. Using the latest FPGA (Field Programmable Gate Array) digital Technology. It can be programmed to cancel problem harmonics ...
http://www.maxsine.eu/