solve simple problem

Discussion in 'Homework Help' started by devnarayan, Jan 2, 2011.

  1. devnarayan

    Thread Starter New Member

    Jan 1, 2011
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    in given fig. each network have voltage gain 1/2 then voltage gain of cascaded is (a)1/4 (b) 1/5 (c)1/6 (d)1 select correct option. answer provided is 1/5 ,any one can explain how 1/5 is correct
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    You'll get a better response in the Homework Forum. I suspect you are new to the board, since you could have modified the other post you made.

    Welcome to AAC!
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Simply find voltage across R4 resistor in this circuit.

    [​IMG]

    And if you find this voltage you will know that
    VR4 = 1/5 * 1V = 0.2V
     
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  4. devnarayan

    Thread Starter New Member

    Jan 1, 2011
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    sir why you not directly apply the gain concept since gain of individual network is 1/2 so gain of overall becomes 1/4.
     
  5. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
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    No, the gain is equal 1/5 because the load effect.
    Second network load the first, and that is why the gain is drop to 1/5.
    The output voltage of a first network will be 2/5
     
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