TL074 Open-Loop Gain vs Frequency

Discussion in 'Electronics Resources' started by pdunc, Apr 28, 2010.

  1. pdunc

    Thread Starter New Member

    Feb 26, 2010
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    The unity gain-bandwidth [product] is quoted as 3MHz.

    So at the quoted 88dB level the open loop bandwidth would be about 119.4Hz.
  3. Ghar

    Active Member

    Mar 8, 2010
    There's an open loop frequency plot in figure 12, page 13 of the datasheet however it shows the typical curve, assuming an open loop gain of 200,000 or 106 dB.
  4. rudi

    New Member

    May 3, 2010
    Hello to all,

    I am a newcomer, but if I may, I could try an answer for this question.
    The DC Gain, form figure 12 is over 100dB and it begins to drop at the frequency of the first pole, in the transfer function.
    This pole, as I can guess from the architecture, is given by the first (input) stage and the time constant associated to it is equal to the total RC from the first stage's output.
    If you look at the phase, that drops by 90 degrees around about 40Hz...but the actual w of the pole...that I don't think you can calculate because TI won't specify the actual size of the transistors used in the OpAmp.

    Hopefully this helps you a little.
  5. pdunc

    Thread Starter New Member

    Feb 26, 2010
    Thank you all. Don't know how I missed that figure!