Amplifier design problem

Discussion in 'Homework Help' started by Dias, Nov 1, 2006.

  1. Dias

    Thread Starter New Member

    Nov 1, 2006
    1
    0
    Hi,
    I am new here, hope you can help me. :)

    My problem: Design an amplifier with A= 100,0 at DC, and with -3db bandwith "bigger or equal to" 40Khz.
    Avalible components: uA741 (op-amps) and resistors.

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    Solution:
    (see the drawing)

    A1=A2= (27/3 + 1) = 10
    A= A1*A2=100,0
    100,(!)0??

    GBP= 1Mhz (datasheet)
    -3db frequency = GBP / A1 = GBP/A2 = 1Mhz/10 = 100Khz ???
    100Khz > 40Khz , ok!

    Can this be correct?
    Any help or advise would be appreciated.
    ------------------


    *Thanks*
     
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  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    It looks good to me. Cascading low gain amplifiers is a good strategy for achieving higher bandwidth. Can you figure out what the major disadvantage is?
     
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