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How to build passive bandpass filter using FET???

Discussion in 'General Electronics Discussion' started by anip, Mar 28, 2011.

  1. anip

    anip

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    Mar 28, 2011
    I have a problem to design passive bandpass filter using FET, please help me???:confused:
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    If it has a FET in it then it's no longer a passive filter.
     
  3. anip

    anip

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    0
    Mar 28, 2011
    i know that FET is active component....but we can design it as a resistor to make it passive right?? so the graph is become linear....so how to make it operate as resistor??
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,689
    Jan 21, 2010
    Aaaah, now I understand.

    You place it in the circuit where you would normally have a resistor and set up a variable DC bias voltage between the gate and source.

    Google "FET as a variable resistor" for many examples.
     
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