Third-order Intercept Point

In telecommunications, a third-order intercept point (IP3 or TOI) is a measure for weakly nonlinear systems and devices, for example receivers, linear amplifiers and mixers. It is based on the idea that the device nonlinearity can be modeled using a low-order polynomial, derived by means of Taylor series expansion. The third-order intercept point relates nonlinear products caused by the third-order nonlinear term to the linearly amplified signal, in contrast to the second-order intercept point that uses second order terms.

The intercept point is a purely mathematical concept, and does not correspond to a practically occurring physical power level. In many cases, it lies far beyond the damage threshold of the device.

Read more about Third-order Intercept PointDefinitions, Practical Considerations, Theory

Other related articles:

Third-order Intercept Point - Theory
... The third-order intercept point (TOI) is a property of the device transfer function O (see diagram) ... cos(ωt), plus a new harmonic term, cos(3ωt), the third-order ... intersect), we find that this happens when which is the Third-Order Intercept Point (TOI) ...

Famous quotes containing the words point and/or intercept:

    One point in my public life: I did all I could for the reform of the civil service, for the building up of the South, for a sound currency, etc., etc., but I never forgot my party.... I knew that all good measures would suffer if my Administration was followed by the defeat of my party. Result, a great victory in 1880. Executive and legislature both completely Republican.
    Rutherford Birchard Hayes (1822–1893)

    Colonel, never go out to meet trouble. If you will just sit still, nine cases out of ten someone will intercept it before it reaches you.
    Calvin Coolidge (1872–1933)