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Question about active, second-order filter

Discussion in 'General Electronics Discussion' started by ohio_rifleman, Jul 15, 2011.

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  1. ohio_rifleman

    ohio_rifleman

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    Jul 15, 2011
    I am looking at someone's design of an active, second-order filter. Here it is:

    http://i1103.photobucket.com/albums/g471/ohio_rifleman/2ndorderfilter.jpg

    I find this design unusual, in that it is simply two, passive, first-order filters connected in series followed by an op amp buffer. I have never seen this before; in my experience, active, second-order filters always have a Sallen Key or multiple feedback topology.

    Why would someone use this filter in lieu of a Sallen-Key or multiple feedback topology? Are there any advantages to this design? Are there disadvantages to this design? If so, what are they?


    Thank you
     
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