Confused in concepts of Q-point

Discussion in 'General Electronics Chat' started by engg_fahd, Feb 26, 2011.

  1. engg_fahd

    Thread Starter New Member

    Feb 23, 2011
    Why do we find Q-point at no input signal?
  2. Adjuster

    Well-Known Member

    Dec 26, 2010
    By definition, the Q-point is the quiescent working point, in other words the current and voltage conditions which apply in the absence of any signals.

    Applying an input signal causes the conditions to swing away from the Q-point. The amplifier is not then in its quiescent condition. In the presence of a signal, even the average working point may depart from its quiescent value due to non-linear effects.
    engg_fahd likes this.
  3. Audioguru

    New Member

    Dec 20, 2007
    The Q-point for a class-A common-emitter transistor is calculated so that the output can swing a maximum amplitude symmetrically.
    engg_fahd likes this.