Bandwidth of inverting amplifier (open loop)

Discussion in 'Homework Help' started by need_help, Feb 2, 2010.

  1. need_help

    Thread Starter New Member

    Sep 7, 2009
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    Op-amp with Ao=100db and dominant-pole ar 4Hz is used as an inverting amplifer with gain of -100. What is the bandwidth of the inverting amplifier?

    Any ideas?
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A gain of 100 is 40dB.
    A 741 opamp has its pole at about 4Hz and has an open-loop gain of slightly more than 100dB. At a gain of 100 its bandwidth is 9kHz.
     
  3. need_help

    Thread Starter New Member

    Sep 7, 2009
    23
    0
    So what would happen if we use non-inverting amplifier with a gain of +100? What would be the bandwidth this time?
     
  4. Audioguru

    New Member

    Dec 20, 2007
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    896
    The bandwidth of an inverting opamp and a non-inverting opamp are almost the same when the gain is high.
     
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