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opamp supply vtg

Discussion in 'General Electronics Discussion' started by bubble, Mar 23, 2014.

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  1. bubble

    bubble

    4
    0
    Mar 23, 2014
    For OPAMP +VCC= 5V AND -VCC= -5V given in circuit diagram. If I apply +5V to +VCC and 0V to -VCC terminal of OPAMP IC; DOES IT MAKE A DIFFERENCE?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,160
    2,548
    Nov 17, 2011
    Welcome here.

    To answer your question: Yes it does.

    1) The original setup suplies +5V and -5V to the OpAmp. Therefore the effective supply voltage is 10V. In your setup, where -Vcc?0V, the efective voltage is only 5V.

    2) By supplying +/- 5V to the OpAmp, the original circuit ensures that the OpAmp can handle signals ner 0V. When -Vcc=0V, only special OpAmps called rai-to-rail OpAmp can handle signals near 0V. You cannot handle negative signals with -Vcc=0V.
     
  3. bubble

    bubble

    4
    0
    Mar 23, 2014
    Thank you!

    Thank you!:)
     
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