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single supply opamps

Discussion in 'General Electronics Discussion' started by Pavan Karjol, Sep 26, 2012.

  1. Pavan Karjol

    Pavan Karjol

    1
    0
    Sep 26, 2012
    Is there any internal structural difference between single supply and dual supply opamps ?
    Can we use dual supply opamps as single supply opamps?Pls suggest me references about basics of single supply opamps. Thank you..
     
  2. rob_croxford

    rob_croxford

    262
    0
    Aug 3, 2010
    Some dual supply Opamps will allow use with a single supply. The output of a single supply opamp will be limited from 0V to somewhere close to the opamp supply.

    Some opamps however will not function correctly with a single supply. Check the datasheet.
     
  3. BobK

    BobK

    7,599
    1,641
    Jan 5, 2010
    The major difference between single supply opamps and dual supply opamps is how close the inputs and outputs can go to the power rails. In old dual-supply opamps like the 741 the outputs could typically only get to withing about 2V of the rails, hence the +-15V standard.

    Opamps called single-supply can often get close the the - rail, but still not to the + rail.

    Modern opamps that are ideal for single-supply use are usually called rail-to-rail. An opamp that claims rail-to-rail inputs and outputs is the best choice for single supply use. These allow both inputs and outputs to range over the entire supply voltage (and the inputs, often even further than that).

    Hope this helps.

    bob
     
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