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Abstract-It is shown in this paper how the classical concept of the "network analyser" can be extended towards modulated and large-signal operating conditions. The concept is demonstrated by measuring the saturated behaviour of a MMIC amplifier, excited by modulated signals with CDMA characteristics. It is then illustrated how the measured data can be used to construct an accurate behavioural model.

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-Novel generic frequency domain behavioural models are constructed for mixers and amplifiers. The modelling is based upon three concepts: time-invariant describing functions, linearisation and multidimensional curve fitting. The model parameters can be calculated based upon measured or simulated data. Model performance is illustrated on practical examples.