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Op Amp Question: Input Load

Discussion in 'General Electronics Discussion' started by Raven Luni, Jan 22, 2013.

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  1. Raven Luni

    Raven Luni

    798
    8
    Oct 15, 2011
    Greetings,

    Just wanted to be 100% clear on something I'm working on: If I'm using a fixed resistor divider as an input for a comparator, can I take several similar inputs from the same point or does each op amp have a loading effect that would shift the bias. I dont imagine I'll be feeding any more than 4 op amps at a time this way.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    Unless there is some feedback to the input that is connected to this voltage divider, the input impedance is probably too high to have any measurable effect.

    There is a slight potential issue with offset voltages caused by input offset currents through unequal impedances on the inputs, but this would typically be very, very small.
     
  3. Raven Luni

    Raven Luni

    798
    8
    Oct 15, 2011
    cool thanks :)
     
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