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Comparator vs. Op Amp...

Discussion in 'General Electronics Discussion' started by dtvonly, Feb 27, 2014.

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  1. dtvonly

    dtvonly

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    Mar 14, 2012
    In general an op amp can be used as a comparator, even though the slew rate is slower. However, can a comparator be used as am Op amp?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
    2,780
    Jan 21, 2010
    Is this homework?

    What is the difference between an op-amp and a comparator? Look at the output capabilities. How can you make a comparator output act more like an op-amp's?
     
  3. Arouse1973

    Arouse1973 Adam

    5,164
    1,081
    Dec 18, 2013
    Things to think about for both.
    1)Stability.
    2)Input offset
    2)CMR.
    3)Output structure.
    4)Driving logic gate.
    5)Differential voltage range.
    6)Common mode voltage range.
    7)Speed / Bandwidth

    Adam
     
  4. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Some hints for your answer may be gleaned from Analog Devices AN-849 "Using Op Amps as Comparators" http://www.analog.com/static/imported-files/application_notes/AN-849.pdf but the most important consideration may be that comparators are not intended for negative feedback operation so have not been internally compensated nor provisions made for external compensation. What does that mean? Also, a comparator is meant to provide a logic signal, so it has not been designed with a linear output stage. What are the implications of that?
     
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