Emitter follower gain

Discussion in 'General Electronics Chat' started by Gordon Freeman, Oct 1, 2016.

  1. Gordon Freeman

    Thread Starter New Member

    Sep 6, 2016
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    I am calculating the gain of a common collector amplifier. It seems that Vout =Vin and the gain is always 1. Anything wrong?
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,647
    632
    Very close, at least for small low frequency AC signals.

    The emitter has some resistance (dependent upon current and temperature), so if the emitter load is anything other than an ideal (infinite impedance) current source you will have some loss because of the drop across the emitter resistance.
     
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  3. Gordon Freeman

    Thread Starter New Member

    Sep 6, 2016
    18
    1
    Thank you!
     
  4. hp1729

    Well-Known Member

    Nov 23, 2015
    1,939
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    Voltage gain, current gain or power gain? Yes, voltage gain is not the objective in that circuit.
     
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  5. crutschow

    Expert

    Mar 14, 2008
    12,986
    3,224
    That's why it's called an emitter follower circuit.
    The emitter basically follows the base.
     
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