Bias circuit explaination

Discussion in 'Homework Help' started by vustudent, Mar 16, 2011.

  1. vustudent

    Thread Starter Active Member

    Mar 11, 2009
    38
    0
    How is the drain of M1 locked at Vref?

    [​IMG]
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    Do you mean Vtune?
    The feedback forces the two inputs of the op amp to be equal. If you don't understand op amps and feedback, read this: http://www.allaboutcircuits.com/vol_3/chpt_8/4.html
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,990
    1,115
    But in this diagram we have positive feedback, a silly mistake ?
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    You're right. I missed that.
    Probably a mistake, as you said.
     
Loading...