small signal analysis

Discussion in 'General Electronics Chat' started by everton123uk, Apr 15, 2013.

  1. everton123uk

    Thread Starter New Member

    Apr 15, 2013
    1
    0
    hi,

    Ive got a question that bothers me a little, small signal analysis is basically understanding that a linear relationship exists between Vbe & ic, this relationship is only valid if Vbe is less than 10mv, and it implies that the transistor behaves as a voltage controlled current source when vbe, the input signal between base and emitter is less than 10mv, im fine with that, but lets say i input 10mv into a transistor with a gain of 10, then the output voltage will be 100mv, say i wanted to input that 100mv into a second transistor, would the linear model still apply, i'm getting really confused over this.

    Any help is welcome thanks.. H
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    Remember that your small signal waveforms are riding on top of the DC bias waveforms. Also, remember that "input" and Vbe are not, in general, the same thing.

    To get any more specific, please post some kind of example schematic for us to focus the discussion on.
     
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