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A Distortion Contribution Analysis (DCA) obtains the distortion at the outputof an analog electronic circuit as a sum of distortion contributions of itssub-circuits. Similar to a noise analysis, a DCA helps a designer to pinpointthe actual source of the distortion. Classically, the DCA uses the Volterratheory to model the circuit and its sub-circuits. This DCA has been provenuseful for small circuits or heavily simplified examples. In more complexcircuits however, the amount of contributions increases quickly, making theinterpretation of the results difficult. In this paper, the Best LinearApproximation (BLA) is used to perform the DCA instead. The BLA represents thebehaviour of a sub-circuit as a linear circuit with the unmodelled distortionrepresented by a noise source. Combining the BLA with a classic noise analysisyields a DCA that is simple to understand, yet capable to handle complexexcitation signals and complex strongly non-linear circuits.

Distortion Contribution Analysis with the Best Linear Approximation