Help in electronic device

Discussion in 'Homework Help' started by full, May 25, 2014.

  1. full

    Thread Starter Member

    May 3, 2014
    225
    2
    hi,

    I do the loops 1 and 2 in figure A , DC Biasing of a JFET
    true?

    thanks
     
  2. #12

    Expert

    Nov 30, 2010
    16,318
    6,818
    The first one looks right, except in the real world, Ig is going to be picoamps, so the voltage across Rg is pretty much unmeasurable.
    The second one either has the plus and minus signs wrong or you're using the labels on the drawing to do things differently from how I'd do it.
     
  3. full

    Thread Starter Member

    May 3, 2014
    225
    2
    ,,,,,,,,,,,,,,,,,,
     
    Last edited: May 26, 2014
  4. full

    Thread Starter Member

    May 3, 2014
    225
    2
    !#





    1
    -
     
    Last edited: May 26, 2014
  5. full

    Thread Starter Member

    May 3, 2014
    225
    2
    ?!



    ,
     
  6. full

    Thread Starter Member

    May 3, 2014
    225
    2
    the Vdd I should change to => -Vdd+ same this?
     
  7. #12

    Expert

    Nov 30, 2010
    16,318
    6,818
    Here's the way I would write it.
    Loop2: Vdd-|Vgs|-|IdRd| = 0

    (Using, "absolute value" signs.)
     
    full likes this.
  8. full

    Thread Starter Member

    May 3, 2014
    225
    2
    ok , thanks

    I will do loops in fig B,C,D
     
  9. full

    Thread Starter Member

    May 3, 2014
    225
    2
    I do loops in fig B ,C,D
    right?
     
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  10. full

    Thread Starter Member

    May 3, 2014
    225
    2
  11. #12

    Expert

    Nov 30, 2010
    16,318
    6,818
    Sorry about the delay. I had to sleep last night and go to a doctor this morning.
    Still, I usually don't do Homework problems because my education is too old to relate to what is being taught now. I don't know about Vth so you're going to have to wait until somebody else contributes.

    Now, I have to go to my real job.
     
  12. full

    Thread Starter Member

    May 3, 2014
    225
    2
    ok, thanks a lot ,sir
     
  13. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Why all your voltage sources are reverse?
     
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