Closed loop op-amp gain (double check)

Discussion in 'General Electronics Chat' started by Engineering_Junkie, Oct 5, 2016.

  1. Engineering_Junkie

    Thread Starter New Member

    Sep 9, 2015
    14
    0
    Hey everyone,

    I just want to double check my calculation on closed loop gains of operational amplifiers,

    I'll be amplifying a DC signal by 25, the open loop gain from the data sheet is http://imgur.com/a/uajei
    or roughly 100 x (10^6) V/V at 0 Hz.

    For my closed loop system I'll be amplifying by 25 or 25 V/V so this will result in roughly a gain 27.95 DB from this calculation (https://e2e.ti.com/support/data_converters/audio_converters/f/64/t/50665)

    which results in the following bandwidth: http://imgur.com/a/TlzYu

    Is this correct?

    Thanks in advance for any help!
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,292
    1,255
    Use the gain bandwidth number from the data sheet and divide it by your gain.
     
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  3. tindel

    Active Member

    Sep 16, 2012
    568
    193
    Looks like your graph is right to me! Assuming you are not using any filtering with your gain and that you are using a standard opamp configuration.
     
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  4. Engineering_Junkie

    Thread Starter New Member

    Sep 9, 2015
    14
    0
    Thank you! no filtering and a standard non-inverting op amp :)
     
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