BJT voltage gain

Discussion in 'Homework Help' started by hamza324, Jul 10, 2011.

  1. hamza324

    Thread Starter Member

    Jul 10, 2011
    33
    1
    hi ....

    I was reading through my book and could understand the difference between "terminal voltage gain" and "overall voltage gain"
    BJT single stage amplifiers
     
    Last edited: Jul 10, 2011
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Can you show as the diagram or the text from that book.
    General speaking when we treat the amplifier alone the the voltage gain is equal
    Av = Vout/Vin

    [​IMG]

    But if we consider the influence of the source resistance and input resistance of our amplifier we get the overall gain.

    Overall gain = Vout/Vs = Vin/Vs * Vout/Vin = 0.5 * 100 = 50V/V
     
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  3. hamza324

    Thread Starter Member

    Jul 10, 2011
    33
    1
    Thanks...it was helpful
     
  4. lazukan

    New Member

    Mar 29, 2011
    5
    0
    terminal voltage gain refers to V (collector ) / V ( base)= Beta
    Overall voltage gain refers V ( out) / V( in)
    It is the matter of the fact that at which terminal or branch you take the measurements

    Correct me if i am wrong

    Lazukan
     
  5. RLC

    New Member

    Jul 20, 2011
    13
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    Terminal gain refers to β gain (Hfe) which we can directly measure on
    Multi-meter.
    While overall voltage gain refers to, taking gain with taking source Impedance and Load impedance into consideration
     
  6. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    β is a measure of current gain: it is not directly related to voltage gain, although due to its effect on input impedance it does make a contribution to overall voltage gain.
     
    Last edited: Jul 21, 2011
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  7. RLC

    New Member

    Jul 20, 2011
    13
    0
    yeah ur right i realized my mistake
    Thank u:D
     
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