OP Amp Diiferential circuit as attenuator

Discussion in 'General Electronics Chat' started by rrrchandu, Nov 5, 2014.

  1. rrrchandu

    Thread Starter New Member

    Aug 9, 2010
    28
    0
    i am using op amp as diiferential atteuator.

    the input to the circuit is more than 5 V and and supply for opamp is +_5V. but because of resistor combinations the input coltage at op amp is below 5v. So can we use this ? is there any non linear distortion?
     
  2. ScottWang

    Moderator

    Aug 23, 2012
    4,858
    768
    Many op amps had show that the input voltage range in the datasheet, maybe they show as Vcc -1.5v, if you using with +/- power, so they will as Vcc-1.5V and -Vcc+1.5V, if you over the range then you have to try that does the output voltage and input voltage following the gain.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    As Scott noted, the input voltage range depends upon the on amp. For an input rail-rail type, the input can go between the rails. For standard types the input range is typically within about 1.5V of the rails. That info is give on the op amp data sheet as the common-mode range.

    As long as the input is within the op amps rated value, there should be no significant distortion.
     
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