What is the configuration of this FET?

Discussion in 'Homework Help' started by rq89, Mar 11, 2015.

  1. rq89

    Thread Starter New Member

    Mar 11, 2015
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    Can anyone please tell me what the configuration of this FET is and perhaps explain why.
    Thanks in advance.
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,173
    1,797
    Did you forget to include an image in your post, cuz I don't see no FET
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    Is there a picture available?
    Without any, we can not answer.

    Bertus
     
  4. rq89

    Thread Starter New Member

    Mar 11, 2015
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    [​IMG] This should be the diagram now. Apologies.
     
  5. WBahn

    Moderator

    Mar 31, 2012
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    4,805
    All of the capacitors are probably chosen so that, at the signal frequencies of interest, they look like short circuits. So consider the names of the three basic amplifier configurations and see if that gives you an idea.
     
  6. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Note that the transistor is a depletion-mode N-JFET which is required for the circuit to properly bias.
     
  7. rq89

    Thread Starter New Member

    Mar 11, 2015
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    The configuration is common source but I'm not sure how this differs from common drain/gate
     
  8. crutschow

    Expert

    Mar 14, 2008
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    A common-drain (source-follower) circuit has a high input impedance, a voltage gain of slightly less than 1, no signal inversion, and a low output impedance.

    A common-gate circuit (signal applied to source) has a low input impedance, a current-gain of 1, and no signal inversion.
     
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