Amplifier using mosfet

Discussion in 'The Projects Forum' started by p3arljam, Dec 14, 2009.

  1. p3arljam

    Thread Starter New Member

    Dec 14, 2009
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    hi guys im new here..so basically i have to designn a amplifer with a phase shift of180 between input and output &with a voltage gain of (av)13
    to feed Rload of5kΩ..well i think it gonna be common source amplifier mosfet cuz of the phase shift but i dun know which biasing technique i should use..any help would be appreciated :)
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Most transistors and Mosfets use a voltage divider for their base or gate voltage then an emitter or source resistor to help stabilize the DC bias. The emitter resistor can be bypassed with a capacitor for high AC voltage gain.
     
  3. p3arljam

    Thread Starter New Member

    Dec 14, 2009
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    any ideas about the numbers or the equations that will help me determine which values i should use for the resistors and the battery ,,
     
  4. whale

    Active Member

    Dec 21, 2008
    111
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    common source confg with bypass capacitor is the best choice.the resistor and source parameter depends on the transistor you choose.the bypass and coupling capacitors value depends on the frequency of your operation.
    c=1/(2(pi)f x). where x is capacitive reactance , choose very low value for it.
     
  5. p3arljam

    Thread Starter New Member

    Dec 14, 2009
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    oh thx for the info and im using the 2N7000 mosfet
     
  6. p3arljam

    Thread Starter New Member

    Dec 14, 2009
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    i still need to know the equations to determine the resistor and source values ;]
     
  7. hobbyist

    Distinguished Member

    Aug 10, 2008
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  8. p3arljam

    Thread Starter New Member

    Dec 14, 2009
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    i am not aware of that :D,,but however i was told to use the 2n7000 mosfet transistor,
     
  9. p3arljam

    Thread Starter New Member

    Dec 14, 2009
    7
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    come on guys :D:D help needed here !
     
  10. ftsolutions

    Active Member

    Nov 21, 2009
    48
    2
    This is beginning to sound like a homework assignment. You can also search in the Homework section for very similar threads/questions as this for more clues. You have not provided any information as to what your power supply voltage, input signal voltage amplitude, or frequency bandwidth should be, so without more specifics, one cannot provide specific answers. Have you downloaded a datasheet for the 2n7000 and looked at the operating information/curves?
     
  11. p3arljam

    Thread Starter New Member

    Dec 14, 2009
    7
    0
    it'll be 10khz freq. ..200m amplitude sin ..and the power supply voltage should be around 10v..and yes i have downloaded the 2n7000 datasheet..
     
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