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    advantage of active filter

    Hi Guys
    what is the advantages of active filter? The only advantage I can think is active filter can give you, is there any other reasons for it?
    Thanks,

    •   Alt1st May 2009, 03:34

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    why do we use active filter

    basically you can adjust gain



    •   Alt1st May 2009, 04:52

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    why we use active filter

    almost free from input and output impedance changes


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    •   Alt1st May 2009, 05:25

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    LvW
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    Re: why do we use active filter?

    Quote Originally Posted by liletian
    Hi Guys
    what is the advantages of active filter? The only advantage I can think is active filter can give you, is there any other reasons for it?
    Thanks,
    There are several adantages:

    1.) Most important: No inductances, which are heavy, expensive, sensitive to electro-magnetic effects, not integrateable, not easy to tune, ....
    2.) Filter design is easy, as you only need to caculate 2nd order stages, which can be cascaded to higher order filters (because of low output impedances)
    3.) They can be tuned by voltages or currents
    4.) They can provide gain
    5.) Active filter topologies can be fully integrated (OTA-C or gm-C approaches)
    6.) They are the basics to design S/C filters


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