OP amps

Discussion in 'General Electronics Chat' started by bwd111, Aug 8, 2013.

  1. bwd111

    Thread Starter Member

    Jul 24, 2013
    117
    1
    Do OP amp generally have high input impedance and very low output impedance or low imput and high output
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,156
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    The former.
     
  3. bwd111

    Thread Starter Member

    Jul 24, 2013
    117
    1
    Already passed my test but thanks. Wanted to know what I misssed
     
  4. bwd111

    Thread Starter Member

    Jul 24, 2013
    117
    1
    and correct answer was high and high output.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    It should've been "high input impedance and low output impedance".
     
  6. WBahn

    Moderator

    Mar 31, 2012
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    Should you ever decide you want to actually learn something, you might consider switching to a school that is going to teach something instead of just giving you exams with wrong answers.

    Also, the input-ouptut impedances depend on what kind of operational amplifier is being talked about. Most people think first about voltage-feedback amplifiers (and this was almost certainly what was meant in the question), in which case it is high input impedance and low output impedance. But there are also current-feedback amplifiers, transconductance amplifiers, transimpedance amplifiers...
     
  7. pwdixon

    Member

    Oct 11, 2012
    488
    56
    That wasn't even one of the options you were offering in the first place!

    Perhaps giving us the complete text of the question would have put it into context.
     
  8. bwd111

    Thread Starter Member

    Jul 24, 2013
    117
    1
    It was on certain controls and I really don't want to waste time on that when I will be specializing in another area that will have nothing to do with this class.
     
  9. bwd111

    Thread Starter Member

    Jul 24, 2013
    117
    1
    My mistake you are correct that was the right answer
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,156
    3,063
    Do I get a diploma?
     
  11. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    I do not think so. You had time to think (or peek at a book, maybe) :D :D :D
     
    bwd111 likes this.
  12. WBahn

    Moderator

    Mar 31, 2012
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    I can print you up one. :D
     
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