MOSFET differtial amplier question

Discussion in 'Homework Help' started by Digit0001, Mar 19, 2012.

  1. Digit0001

    Thread Starter Member

    Mar 28, 2010
    89
    0
    Hi

    I am have trouble understanding the following question
    View attachment question6_mosfetdiffamp.pdf
    The book's answer has Rd=5-2/0.08=37.5k when i am finding Rd

    however i got

    Rd=10-2/0.08 = 100

    what is my mistake?

    P.S
     
    Last edited: Mar 19, 2012
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,321
    304
    your mistake is to call mosfet problem BJT (at least that is in the file name).

    if the Vdd=+10V, Vo=2V and Id=80uA then Rd=(10-2)/(80*10^-6)=100k
     
  3. Digit0001

    Thread Starter Member

    Mar 28, 2010
    89
    0
    fixed the thread title and file name
     
  4. Digit0001

    Thread Starter Member

    Mar 28, 2010
    89
    0
    so is my book's answers wrong?
     
  5. panic mode

    Senior Member

    Oct 10, 2011
    1,321
    304
    if that answer relates to that exact circuit then yes (and it would not be the first error in a textbook).
     
  6. Digit0001

    Thread Starter Member

    Mar 28, 2010
    89
    0
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