Op Amp Open Loop Frequency Response

Discussion in 'Homework Help' started by TommyTrance, Feb 22, 2012.

  1. TommyTrance

    Thread Starter New Member

    Feb 22, 2012
    2
    0
    Hi all,


    I have been given a question which asks to define;
    a) the slew rate of an Op Amp
    b) the open loop frequency response of an Op Amp


    i have obtained information about the slew rate, but the open loop frequency response is being tricky. can any one give me advice on this one? Is open loop frequency response the same as open loop gain?


    Cheers


    Tom
     
  2. #12

    Expert

    Nov 30, 2010
    16,292
    6,804
    I would guess that the gain-bandwidth product divided by the voltage gain (open loop) would be the frequency limit.

    Name a chip, get the datasheet, and read the specs. Hopefully the information will be there for the taking.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    A normal compensated opamp has a -6dB octave rolloff (single pole) with frequency that typically starts at a low frequency and continues past the point where the gain drops to 1. The opamp data sheet will show that.
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Here is a graph (from the datasheet) of the open-loop frequency response of a lousy old 741 opamp. It has lots of gain from DC to about 3.2Hz.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    Have a look at the attached PDF,

    Bertus
     
  6. TommyTrance

    Thread Starter New Member

    Feb 22, 2012
    2
    0
    Thankyou all for your replies, really appreciate it :)
     
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