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Small signal vs. Large signal analysis

Discussion in 'Electronic Basics' started by [email protected], Jan 11, 2005.

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  1. Guest

    Hello... I am new to the field of electronics engineering and have a
    basic question about something that has been the source of some
    confusion. I have taken an electronic devices and circuits course in
    an Electronics Engineering Technology program and am familiar with
    diode circuits as well as BJT and FET transistor circuits. However,
    I've heard the terms "small signal analysis" and "large signal
    analysis" being referred to several times, but it has never been fully
    explained. Can someone please explain what these terms mean, the
    difference between them, and when & why to use them in a given circuit
    analysis/design. Any help would be appreciated.

    Thanks,

    Patrick
     
  2. Small signal analysis assumes that the signal swing is so small that
    all nonlinearities of all the components can be ignored. The circuit
    is analyzed as if it is made entirely of perfectly linear components
    that are characterized for the operating bias point of the circuit.
    This is strictly an AC analysis (amplitude and phase response with
    respect to an AC reference signal). over a range of selected
    frequencies.

    Large signal analysis makes none of these simplifying assumptions, and
    models the full nonlinear response of all the components, through
    simulated elapsed time, with an arbitrary stimulating signal.
     
  3. Miles Harris

    Miles Harris Guest

    True. AKA in simulation: 'transient analysis'.
     
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