Linear/Non-Linear Junctions

Discussion in 'General Electronics Chat' started by SSgtKirby, Jan 21, 2011.

  1. SSgtKirby

    Thread Starter New Member

    Jan 20, 2011
    Could someone please explain/direct to me the difference between linear and non-linear junctions? The only info I seem to be able to find is the detection of non-linear junctions through RF harmonics. Thank you!
  2. SgtWookie


    Jul 17, 2007
    Normally linear components, such as points of contact, can become nonlinear elements. These can occur in coupling hardware of coaxial transmission lines, in flanged joints of wave guides and in other waveguide components that are bolted together.

    Chemical compounds build up on metal contact surfaces exposed to the atmosphere. The compounds, oxides and sulphides for example, are semiconductive and tend to increase contact resistance. They have a non-linear current-voltage characteristic that can be used to characterize Metal-Oxide- Metal junctions by non-linear measurements.

    When a pure sinusoidal current flows through a component (point of contact) the voltage across it is distorted by any nonlinearities present. The distorted voltage can be considered the sum of a fundamental frequency voltage and a number of voltages at harmonic frequencies. The magnitude of these harmonic voltages can serve as a measure of the nonlinearity present in the contact. For convenience, the third harmonic is usually chosen since it has the largest magnitude and therefore is easiest to measure

    SSgtKirby likes this.