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TRYING to compare bipolar, Fet and Mosfet transistors

Discussion in 'Electronic Basics' started by chriswilliams, Oct 5, 2006.

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  1. Hi all:

    I am trying to compare bipolar, FET and Mosfet transistors
    Could be said that the FET and MOSFET are transistors of a greater
    amplification capacity than the bipolar but they carry out the same one
    function that is to amplify?
    In various circuits they seem to be used for the same functions that
    the bipolar
    Thanks in advance for any comment
  2. Lord Garth

    Lord Garth Guest

    Take a peek inside your computer and you'll see many MOSFET that are used as
    switches. Study upon how the characteristics of the various structures
    Relate the advantages and disadvantages of each.
  3. Johnny Boy

    Johnny Boy Guest

    Hello Chris, to put it simply, a bi-polar transistor is current driven i.e
    The output is dependent on the current into the base, while a FET or MOSFET
    are voltage driven and the output depends on the voltage applied to the
    gate. The gates of FETs and MOSFETS are essentially capacitors and virtually
    no current flows after the gate capacitance has been charged.
    All three can be used as amplifiers or switches.

    .... Johnny
  4. Jamie

    Jamie Guest

    bipolar are current controlled devices, where is the fets are voltage
    controlled devices.
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