op amp unity gain bandwith & slew rate

Discussion in 'Homework Help' started by notoriusjt2, Oct 31, 2010.

  1. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
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    0
    [​IMG]

    my book states the following

    SR=ΔV/Δt
    unity gain bandwith = gain bandwith product
    GBW=Ao * f-3dB

    how do i find the open loop gain of this
    and
    what the heck is f-3dB
    and
    SR=ΔV/Δt
    is the change in voltage the difference between 20mV and 6V?
    what is the change in time?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    Read this application note on amplifier specifications.

    Bertus
     
  3. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
    209
    0
    that looks like a great read on the op amp. I am printing it out now. however, I dont have enough time to read the whole thing right now. I did find some useful formulas though


    B1(unity-gain bandwith) specifies the frequency at which AVD of the op amp is 1:

    so

    B1 = f @ AVD = 1
    AVD=differential voltage amplification
    no formulas to find AVD though
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Slew rate is the fastest speed an op amp output can move. It can resemble frequency response, but it isn't. It has to do with waveform reproduction.
     
  5. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
    209
    0
    AVD - Differential voltage amplification

    The ratio of the change in the output to the change in
    differential input voltage producing it with the common-mode
    input voltage held constant.

    20mV/6V?
     
  6. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
    209
    0
    figured this one out, the answer is E, thanks for the help
     
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