Need help, E-MOSFETS

Discussion in 'Homework Help' started by JohnM1, May 7, 2015.

  1. JohnM1

    Thread Starter New Member

    May 7, 2015
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    Can't work this one out, can anyone help? **Please note part (a) isn't really a question, blame my electrotechnology lecturer for that.. **
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
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    If this is homework, you need to post in that forum. Otherwise some well intentioned person will help you cheat.

    Besides, the question is ambiguous. What polarity are the MOSFETs? Hope that wasn't supposed to be a trick question...
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    what do you make of the questions then???
     
  4. JohnM1

    Thread Starter New Member

    May 7, 2015
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    Thanks for the reply, only new to this site, hadn't realised. It's an old exam question from a couple of years go, but I can only assume it's an N-Channel MOSFET, just because this was the only type we looked at, but thanks anyway, glad it's not only me who finds this slightly ambiguous
     
  5. JohnM1

    Thread Starter New Member

    May 7, 2015
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    I have attempted the questions, think I made a correct diagram, not entirely sure though, and as for part (b) I really just don't know where to start, and unfortunately, there's not solution anywhere to try work backwards from
     
  6. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Any attempt from your site?
     
  7. dl324

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    Post your schematics and your analysis.
     
  8. JohnM1

    Thread Starter New Member

    May 7, 2015
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    Yeah, here's the diagram I drew anyway, not sure if it's correct or not, best I could come up with without finding any similar examples.. Not entirely sure if the 10V should be where it is or connected to the drains
     
  9. JohnM1

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    May 7, 2015
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    As for math workings, I really don't know where to start I'm afraid, even a push in the right direction would be appreciated
     
  10. Jony130

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    Feb 17, 2009
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    If I understand description correctly, your diagram is incorrect.
    Is the upper transistor gate connected to drain ?
    Are you sure that this is a series connection ?
     
  11. dl324

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    I'd interpret having an upper and lower device as being in series, which is a common configuration.

    What isn't clear is how many inputs there are.

    If you don't know the answer and are unclear about the question, what is the point of answering them?
     
  12. JohnM1

    Thread Starter New Member

    May 7, 2015
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    I think I get what you mean about the upper transistor being connected to drain, thought it was connected in series.. Does this not mean that the source from one goes to the gate of the next? Can't find any examples of MOSFETS connected in series ( or at least as far as I can tell, could be completely misunderstanding it, probably am to be honest)
     
  13. JohnM1

    Thread Starter New Member

    May 7, 2015
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    Purely just because it came up in the past exam papers twice in a row. But yeah, think I'll give up on this one and pray it doesn't come up a third time, thanks for the help anyway
     
  14. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Unclear ?? How can it be?
    What is unclear in this sentence?

    Try Google "cs amplifier with active load"
     
  15. JohnM1

    Thread Starter New Member

    May 7, 2015
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    Will do, thanks

    EDIT: just searched that, actually helps a lot, with the diagram and general understanding at least, I'll have another try at the maths again soon, thanks
     
  16. dl324

    Distinguished Member

    Mar 30, 2015
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    Well pardon me for breathing...
     
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